Originally posted by Q99
And in my experience, dodging/reaction calcs normally quite overestimate things, compared to how the characters actually move around.
Well a lightning bolt moves about 61.1 miles/second. Light moves about 186,000 miles/second. The speed of a jump is in noway connected to movement or combat speed, but I do feel like about 25% light speed would be a good estimate for Boros' speed. So let's say Boros can move about 46,500 miles/second. That would make Boros around 761 times faster than Gilthunder. However, Meliodas and Gilthunder have dodged and out sped lightning already in the series. Characters even weaker than them, such as Diane and Ban, have dodged or outsped Gil's lightning as well.
So claiming them to be the speed of lightning is a serious lowball. I'd assume that Gilthunder can probably move about twice as fast as lightning at least, which seems like a fair guess given how much stronger he is than the weaker characters who have outran or dodged it. Meliodas is about twice as strong as Gil, conversely. Meaning he's probably capable of moving about 244.4/second. But that's only suppressed Meliodas. Meliodas got roughly ten times more powerful after regaining his full strength. Meaning he could move roughly about 2,444.4 miles/second. This is only about 1/20th as fast as Boros can move at full speed. However, Meliodas also has demon form, which so far doesn't have a defined limit. He gets way stronger with Demon form, but we don't know how much stronger. If we assume he was about ten times stronger though in demon form at full power, that would make him about half as powerful/fast as Boros in his Aerobic mode.
So overall, yes, Boros would still be superior to Meliodas. But Ban would really decide this fight here. With snatch, he could steal about enough power from Boros to become as strong as Galan, if not even stronger. Galan was massively powerful, but not enough to make Boros lose this. HOWEVER, Boros also would get the equivalent of Galan's strength taken away from him, while Ban received it. This would definitely make the fight even enough for Ban's unlimited regeneration to eventually bring him out on top, as long as Meliodas was assisting him.
And again, Boros would have no knowledge of full counter. When he gets pushed into a corner by their tag team, and is quickly running out of stamina, he would resort to the planet buster roar cannon. Then Meliodas would reflect it back at him, even stronger. This likely wouldn't kill Boros, but it would injure him to the point where Meliodas and Ban could take him out easily.
And even without full counter, Meliodas still has blaze enchantment, which negates regeneration. So Boros would be fighting a peer of his, who has support from a Galan level character, AND his regeneration wouldn't work. While Meliodas has regeneration, and Ban has unlimited regeneration.
He really couldn't win this, even though he's undoubtedly stronger than Meliodas, who we saw as the strongest character in the series.