You are right to some degree with your theory.You are getting into power stroke.A person with a shorter draw can shoot a bow with less brace than someone with more brace and a longer draw and have the same power stroke.This will make the bows have the same "forgiveness factor" in both hands but in a perfect world with a perfect shot, it isn't a factor.
What gets overlooked is reflex and a bow can have an 8" brace and a 2" reflex and would be no more forgiving than a bow with 7" brace and a 1" reflex.
Something else to ponder over while b.s. ing with your friends.