The Champions are in a very awkward situation when it comes to Smash.
trying to make them a 4-1 character seems kind of silly, since it's not like there's anything that ties them together...well, Link does I guess, but we already have BotW Link, and even if you ignored that and did incorporate Link somehow, that'd make it a 5-1 situation, which would be even messier and crazier.
You can't really just pick one champion over the other 3 when all 4 are equally important and are on equal footing (atleast based on BotW1. Never played AoC but I'm assuming its the same there).
you could just add all 4 as individual characters, but then you're adding 4 reps (or 5 if including BotW Link) for ONE game in a franchise. I didn't really care for the fact that FE Awakening got 3 reps, BotW getting 4/5 seems even more overboard.