It's lazy and a waste of a character spot imo. Ganon being a clone of Falcon makes no sense at all when he could have his own set. Falco is essentially the same as Fox and could be replaced with Krystal. Ness/Lucas learn different special moves I think so there's no reason for them to be the same either. TLink could have moves based solely on WW and be different from normal Link. etcetc
you still got the character no? their moves looking the same is a minor issue as long as you got the character and they play differently