Poor analogy. You're using a fighting game as your example, in which the point of the gameplay is recreational, thus making any scenario possible. Try again.
By the way, I've played FF7 10 times over, and there's no way Yuffy can beat Sephy by her lonesome, unless you cheat, or play like a goomba gamer.
If we go by Feats alone here, Dante easily wins, since he is a video game character(the one you're using anyway), and that it's only fair to use him at his best, hence beating bosses flawlessly. Which was my purpose behind the previous post, in which you have apparently missed.