If you were to fight the n64 link vs. GCN link vs. Young Link vs, Brawl Link. Is that even a fair challenge? Brawl would win hands down.
The FSA is too big a factor in matches to even consider the idea of the older sprite winning. The only way that GCN sprites could possibly stand a chance is with Wavedash.
So the theory was a good try but execution of such a feature would really screw up the game.