My expectation is that 10+ of these things are just stages. Another ~10 are probably in modes we've already had hinted at or datamined. I could easily see them including things like new music or new assist trophies in their count.
Ridley was so big that he accidentally left out 9 spots for him in addition to those two.Ridley was so big that you had to list him twice?
Nah, one's stage hazard Other M Ridley, the other is playable Super/Prime/New design Ridley.