I think the main thing is that we won't know until the first DLC is revealed. Slice it however you like, Sylux being gone but the other hunters being there is just weird. Having all Rhythm Heaven characters except Marshal, Tibby and other ones is weird. Porky thing, maybe, but still, he was a boss in Brawl. All other bosses are here as Spirits. Plus why couldn't you still have the Porky Statue? That was a hazard as well. People just don't know, as with Sakurai mentioning Rex Mii costume, it makes it seem as if everything was already planned before. Plus, unlike trophies, Spirits can be used in game. So it's unknown territory. Stuff like Chrom we can assume was added last minute, as he uses the model from Robin's final smash, so that doesn't count. Also Piranha doesn't have one, so is it because they were intended for base, or everything was planned?
We won't know until the first DLC, but I think Spirits getting added post launch can point us to the right direction. Geno still has a pretty decent shot as of now, but we'll know soon enough probably