Gotcha so it’s so self obvious that thing you don’t like is bad, mostly just because you dislike it apparently, and you don’t need to explain otherwise.
Sure that’s the easier and most sensible explainaion. But that isn’t remotely the point of fan theories. There are plenty of ways for them totally miss it if All Might had some kind of unknown quirk he never knew about that let him master OfA so easily. Especially if it was the idea of a quirk that would be totally impossible to activate outside of those circumstances.
Spoiler
Show
Snape kills All Might to gain the final drafonball.