Brainstorming a couple ideas:
- I don't think any of the Tobi Roppo will end up challenging the All Stars. Rather, someone will end up posing as Page 1 and maybe even Ulti to launch a surprise attack on the Beast Pirates. The fact that P1 and Ulti wears face masks, with P1 especially covered up, would certainly facilitate this. Besides which, quite a few major Japanese heroes of lore are known for cross-dressing to take their opponents, and this is Oda we're talking about as well, so I could see a male character posing as Ulti in hilarious fashion, barring someone like Kiku pulling it off much more convincingly, but then I'd expect someone more powerful to play the role to take on an All Star. We'll see.
- Still banking on the Raid failing. Reinforcements from Whitebeard Pirate remnants, the Strawhat grand fleet, and maybe even Shanks will arrive at some later point, but before Luffy and Co. suffer a defeat. That said, I don't see Neko missing out on the action either, so one possibility is that the Number's gift to Kaido is a tied-up Nekomamushi and crew they captured along on the way to Onigashima.
Anything's possible though. I could easily just as well see a scenario where the Numbers found some kinda Trojan Horse in the form of a ship full of sake barrels or something which is hiding Neko and whatever WB pirates he could find. Again, we shall see.
- We need something to play the role of the pheasant to complete Tama's trinity of Momotaro animals, so another thought that came to mind is that the Number may've found some kinda egg belonging to a Roc/Ho-o/phoenix/some special bird. A Roc played a prominent role in proto-One Piece oneshot Romance Dawn, and exotic animals and their eggs are sure to encompass significant plot elements soon enough as well, what with Kaido possibly being an actual dragon according to some theories, the mysterious giant egg on Roger's ship....I foresee Tama and other young characters such as Toko engaging in a stealthy rescue mission to rescue Luffy and Co. if they're captured post-Raid failure, so maybe Tama will make friends with whatever hatches out of said hypothetical egg along the way. Needless to say, pretty sure the Numbers are getting pacified by some handy dandy kibi dangos during it all, thus further weakening the Beast Pirates for the real climax down the line.
Just some thoughts.