Originally posted by Sj_Sharp
No, that's not speculation; contrariwise, pure speculation is to say that Kid Boo has even a hope of landing a hit in this fight.
See:
- Goku said that a fusion of the boys would have been stronger than him and enough to take down Fat Boo. He clearly was referring to Ssj Gotenks, as he also didn't obviously expect the kids to use the Ssj3 (he even told Piccolo that, in order to take down Fatty, a training session in the Rosat would have been unnecessary).
Also, when Ssj Gotenks finally was formed, Piccolo didn't question once his capability to put down Fatso.
So: Ssj Gotenks (pre) >= Ssj3 Goku > Fat Boo
- When Super Boo firstly formed, Piccolo shit himself and said that Gotenks was nowhere close to him in power and that it would have been necessary a training session in the Rosat.
After the boys trained, when Piccolo sees base Gotenks he says that "he truly has changed in power", and even if you don't believe in the power stretch which is base Gotenks (post) > Ssj Gotenks (pre), it surely is, generally, Gotenks (post) > Gotenks (pre).
So: Ssj Gotenks (post) >> Ssj Gotenks (pre) >= Ssj3 Goku > Fat Boo
- Then, when the fight gets serious, Gotenks goes Ssj3 and Goku be like
https://s-media-cache-ak0.pinimg.com/736x/6a/22/ec/6a22ec1372350bb64757502d070d8492.jpg
through the crystal ball of Elder Kai. Ssj3 Gotenks and full power Super Boo are basically evenly matched, some say Gotenks has a little upper-hand in power (which is true, BTW), others say that Super Boo was actually jobbing, waiting for Ultimate Gohan (he sensed him far away in the universe, and which could be true as-well).
So: Ssj3 Gotenks >= Super Boo >> Ssj Gotenks (post) >> Ssj Gotenks (pre) >= Ssj3 Goku > Fat Boo
- After that, Ultimate Gohan arrives (ah, good were the times when Gohan was undoubtly the strongest, now he goes around in a green tracking suit and he doesn't even know if he can even transform in Ssj anymore... **** you AT) and he uses Super Boo as his personal punching-ball; also, Goku's expression at Gohan powering up in his full Chou form was like:
http://www.gatorbytes.net/images/im_shocked.jpg
Thus we have:
Ultimate Gohan > Ssj3 Gotenks (even Trunks, who is usually cocky, says so) >= Super Boo >> Ssj Gotenks (post) >> Ssj Gotenks (pre) >= Ssj3 Goku > Fat Boo
- Then Super Boo uses his brain (that's a news) and wants to absord Piccolo and Ssj3 Gotenks in order to have the intelligence of the former and the shear power of the latter. Besides what happens with Kaioshins (since they are magical beings they influence in a different way Boo's essence when they get absorbed), it is proved that every other type of absorption from Boo does works like a sum of powers: indeed, when Super Boo absorbed Ssj3 Gotenks, his power basically doubled (since Boo himself and Ssj3 Gotenks were nearly even), so now Bootenks is more powerful than Chou Gohan (who had a good margin over Super Boo and Ssj3 Gotenks themselves). In fact, now we have:
Bootenks > Chou Gohan > Ssj3 Gotenks >= Super Boo >> Ssj Gotenks (post) >> Ssj Gotenks (pre) >= Ssj3 Goku > Fat Boo
- Now, seeing that Gohan is in trouble, Goku gets new life from Elder Kai himself and goes to Earth in order to Potara-fuse with Gohan. As clearly stated in the manga by the Old Kai, Potara fusion is more powerful than fusion dance and it doesn't have a time limit.
Gohan anyway is dumb (a guy who, at the very least, has relativistic+ level of reflexes and still doesn't catch a goddam earring

), and while he is searching for the earring, Ssj3 Goku's head is going to be popped up by Bootenks (see by Goku's expression in the manga how badly he was shitting himself there), but exaclty in that moment the fusion inside Boo fades out and he reverts to his "Boocolo" form, who is basically a smarter Super Boo since, power-wise, adding Piccolo's, base Goten's and base Trunks' powers to Super Boo's is like adding a drop of water to the ocean, i.e. and addition which is completely inconsequential.
Goku then recomposes himself after the huge shit he took, he reverts to base form and he calls himself out of the fight: in fact, he was there only with the purpose to fuse with Gohan, but Boo lost Ssj3 Gotenks' powers and reverted back to his base Super Boo's level of power (+ Piccolo's brain), so Gohan could have won alone and fusion was no longer necessary (still, in power, it is Boocolo = Super Boo, so any version of Goku would anyway get murked so bad it isn't even funny). Thus we have:
Bootenks > Chou Gohan > Ssj3 Gotenks >= Boocolo = Super Boo >> Ssj Gotenks (post) >> Ssj Gotenks (pre) >= Ssj3 Goku > Fat Boo
- Gohan gets anyway absorbed (LOL), and thus Boohan is born: since Ultimate Gohan > Ssj3 Gotenks, Boohan is > Bootenks clearly for the same amount, and thus it's evident how Boohan is not even 2x Bootenks in power. Still, he obviously is stronger and now he doesn't even have a time limit.
So: Boohan > Bootenks > Chou Gohan > Ssj3 Gotenks >= Boocolo = Super Boo >> Ssj Gotenks (post) >> Ssj Gotenks (pre) >= Ssj3 Goku > Fat Boo
- Then Vegeta appears, and when Boohan learns that the former and Goku want to fuse, he laughs and says that even a fusion of the two won't be enough (remember that Boohan has Piccolo's and the boys' minds, so he knows everything about metamoran fusion and about the Ssj3 transformation). This is another direct proof of Vegetto's absolute superiority over Gogeta, as the gap the latter has over Gotenks is the same the adults have over the kids, and this gap is specifically said not to be enough to close the distance in power between "normal" Super Boo (who is nearly equal to Ssj3 Gotenks) and Boohan (who outright says that Gogeta wouldn't work against him).
Anyway, Boohan didn't obviously know that Goku and Vegeta were going to use the Potara earrings instead, so Vegetto is born, then turns Ssj and proceeds to make a complete, utter fool out of Boohan, murking him without even using his arms.
Both Vegetto himself and the Elder Kai state that the Potara outcome is even greater than expected, and this is because Goku and Vegeta are 2 of 3 masters in combat in the universe and, furthermore, they are rivals; so: Potara (at Goku and Vegeta) > Potara (expected) > fusion dance.
Being said that, we have:
Ssj Vegetto >> Boohan > Bootenks > Chou Gohan > Ssj3 Gotenks >= Boocolo = Super Boo >> Ssj Gotenks (post) >> Ssj Gotenks (pre) >= Ssj3 Goku > Fat Boo
- Then Vegetto gets himself absorbed in other to free from Boo's body all the others: Goku and Vegeta succeed in that and Boohan reverts back to Super Boo. His power drops so Vegeta (as an usual idiot like he is) says to get out; at that point, Goku shits himself (again) and states that no matter if Super Boo is weaker than Boohan, they would still get one-shotted. He then says that their only way to win is to use fusion dance, but Vegeta refuses.
Every piece of the puzzle fits perfectly, in fact since Ssj3 Gotenks was >= Super Boo, Gogeta would have got the job done against Super Boo as well, given that Gogeta is > Gotenks for the same amount Goku/Vegeta are > Goten/Trunks.
The there is the focal point: Vegeta frees even Fat Boo, and Super Boo begins to change. Goku and Vegeta find a way out of Boo's body and they comment on his transformations: at first, when Buff Boo appears, they shit themselves (poor Goku, how many times has this happened to him during the Boo saga?

) since he is even stronger than Super Boo (but weaker than Bootenks and Boohan), then when Kid Boo is formed they are happy since his power dropped by a huge amount.
Goku then states that fusion is no longer necessary against Kid Boo and that he could beat him on his own with Ssj3: he actually is right, since in pure power he has an albeit small upper-hand (even Vegeta confirms it, by saying that a full power attack from Ssj3 Goku would destroy Kid Boo), anyway, the huge loss in stamina, which is a peculiarity of the Ssj3 form, plus the fact that Goku never rally used that form in a living body, turns the fight in Kid Boo's favor (who is a crazy bubble-gum which never tires).
At this point, in order to give Goku help, Ssj2 Vegeta steps in but gets murked so bad it isn't even funny. You know the rest of the story.
So, the final power chain is:
Ssj Vegetto >> Boohan > Bootenks > Chou Gohan >= Buff Boo >= Ssj3 Gotenks >= Boocolo = Super Boo >> Ssj Gotenks (post) >> Ssj Gotenks (pre) >= Ssj3 Goku >= Kid Boo > Fat Boo > Grey Boo > Good Boo (Good Boo + Grey Boo is = Fat Boo) > Ssj2 Goku = Majin Vegeta = Ssj2 Vegeta (post Majin) > Ssj2 Gohan CG >= SPC > Ssj2 Gohan (Boo saga) > adults Ssj (Boo saga) > Ssj Trunks >= Ssj Goten > Piccolo (Piccolo, against Fat Boo, when Vegeta was dead, Gohan was thought dead and Goku was missing, said that the kids were their only hope, and he didn't even know about fusion at the time) > base saiyans.
Sorry to be blunt, but to say that Kid Boo here has even a chance of seeing Super Boo hitting him before he drops dead is equal to blatantly ignore a whole saga of the manga, and/or pure Goku's fanboyism.
Agree with pretty much everything. The only thing you are wrong about, and you addressed it earlier so I can't beat you up about it, is that Super Buu is clearly stronger than SSJ3 Gotenks. They are close but Super Buu has more than just a slight edge. Other than that, bravo my friend.