You also forgot to mention the extra part from that same comicbook when LT prevented Adam from using his powers. LT then said that he represented powers from High. Furthermore, in the Infinity war, LT permenantly stopped the power of the infinity gems to function as 1. I do believe that they were still able to function independently.
The infinity gems where only created after the cosmic suicide of a being who dwelled in the Multiverse. The fabrication of the Universe was the cause of this beings suicide and the essence of this being are the Infinity Gems. Kind of like how the Beyonder was brought out to be before they nillfed him in Secret Wars 3 saying he was just 5 parts of a cosmic cube. The beyonder at first was from a group of beings that dwelled in the Multiverse called The Beyonders.
Mephisto spoke of this origon in a Silver Surfer comic while speaking to Thanos. However, the authenticity of Mephisto's claim of the creation of the universe is hairy since he does lie alot but, if you don't want to believe his story then it turns out to be which character whos origions comes from which comicbook writer do you want to believe? There have been many inconsistacies with Marvel just for that fact alone. Therefore exactly what is the truth? Any character can suddenly be "the most powerfull" all depending on who writes the story. Wolverine's regeneration ability functions only soo fast. It wasn't till the AOA that Apocalypse accelerated his ability to be virtually immune to any physical attack. You can suddenly give anyone a special ability they never had but, say that it lyed dormant till the right time just like the Uni-Force which is supposed to pop up when the universe is in a time of crises. It never saw the light of day when Thanos had the IG or anytime afterwards.
You can't say that Adam showed brave courage because any insecure human off the street can suddenly present courage instantly that you wouldn't normally see from this person but, only when in possesion of something that would allow them to feel most secure in whatever manner it is without any consequences.
I would like to know what happens between the girl and LT in that quasar comic since LT stated a challenge. If anyone could scan that then that would be cool.
If you want to know someone that can twart the efforts of the LT then look at Korvac. In the reality of Marvel he commited suicide but, in Whatif #32 he didnt. He went on living his life conquiring the cosmos and literaly prevented LT from touching him. LT was shocked and locked that universe from the rest in the multiverse. Korvac relized he was the strongest being in the universe but, not stronger than every single being combined. Korvac eventually destroyed the universe and the multiverse in that parrallel reality is all but, 1 from infinite.
You can even look at the X-Man comic, forgot which one, where they revealed what lied outside of the Multiverse. The Multiverse is a small tiny seed on display in a museum. All the beings that dwell within this area look at it as a display.