This is why I dont expect clean 1v1s on the poneglyph war before LT. Oda has left too many factions around and Imo its going to be a hail mary between a bunch of different people at once.
Imo the only way you justify Luffy (now G6?) or Zoro or Sanji with Conquerors, etc etc fighting certain people is if you have these fights be more of a free for all.
For example (please dont take these matchups seriously, its just to give an idea):
- Luffy vs Blackbeard vs Shanks (more ally than enemy) vs Shamrock (?) vs Akainu vs Buggy (lol)
- Zoro vs Shiryu vs Mihawk vs Fujitora, etc
- Sanji vs Laffite vs Beckman (?) vs Ryokugyuu, etc
The only thing Im confident in is that the 4 Yonko are going to clash along with the Marines and possibly more HKs. This is how you'd justify the "scaling" after this arc even if Imu is forced to leave due to a time limit. Luffy doesnt need to just defeat Blackbeard, he needs to outlast everyone. Same as his crewmates.
That is, imo, what Oda's vision for this and why hes kept a 1000 characters for the endgame.