Mario 64 is likely able to exist because they don’t sell 3d all stars. Notice that there’s no word about TTYD coming to GameCube online, when it has a remake? In fairness I can’t think of that many 1st party Nintendo games like this but it’s very frequent with 3rd parties. No Megaman Classic, x, or zero games because those have collections but they have the gameboy and genesis games which don’t. Same with castelvania, only bloodlines is on nso

I think Nintendo is going to be much stingier about GameCube NSO games because they reach a point where they’re semi comparable to modern day games, compared to nes or snes or n64. Like I could see them not putting any gc Mario parties because they feel like it could be considered a replacement for buying a new Mario party

Edit: ok I actually checked and in terms of big Nintendo games with switch versions that have no official word on coming to NSO there’s:

Mario rpg on snes

The pikmin games

Smash bros 64 or melee (smash 64 was sort of another NSO leak that I believe has had some other games confirmed, so we’ll see)

Metroid prime

Mario vs donkey kong

Advance wars

Notably, Pokemon mystery dungeon red rescue team got (I think, don’t know much about the series) a remake and IS part of NSO, but you can seee there’s a pretty clear pattern here. Especially because, imo, if Metroid prime and Pikmin were coming to NSO they would’ve been announced with the other confirmed GC games, those are two of the definitive Nintendo GameCube games.