Just because nobody has gotten top three with falcon doesn't mean he should not be nerfed. Nobody with any real status as a pro player, say, top 8 best smash 4 players, has picked him up because if they wanted to pick up a character with good combos, nice punish game, they would choose sheik. Falcon has way too many reallly solid attacks (nair, bair, dair, fsmash, dsmash, dash, etc.) to be one of the most balanced characters in the game. You know who is balanced? Greninja. And he got to that point by being nerfed, hard.