Falcomon (Nature Genome) actually has a totally different sprite set in Digimon Unlimited:I love the two Falcomons! The redesigned Yatagaramons and even Kudamons don't look super different, but Falcomon is practically a different specie. It's hard to represent that in black and white without making entirely new sprites.
I don't mean ChaosGallantmon, I mean Gallantmon Chaos Mode, the ChaosGallantmon version of Crimson Mode that only officially exists in toy formGallantmon chaos is already in. Cannondramon, RedVeedramon, and RookChessmon White aren't though. The others don't really matter since I'll have access to their sprites soon enough.
I'm not really planning on adding those at the moment. Or rather, they're pretty low priority to the point of being nonexistent (although they're only hidden in my own copy of the Digimon list - unfortunately Google sheets can't copy that over from Excel). But I put in a lot of effort so that the game is easy to mod, so I'm not too fussed about it.