So in my opinion, Zoro needs to suffer at least one more defeat to get him back into that mindset that he needs to push himself to become stronger, so he himself surpasses Mihawk upon his own merits, and doesn't just surpass him because Mihawk trained him to do so.
The gifters are clearly foreshadowing a test of loyalty for Marimo and the last chapter is making clear that the raid will fail.
Its almost certain at this point that the alliance will fail (even Oda can't subvert this) with the last chapter buidling up a climax at the new flower capital ruled by Kaidou.
In addition, Nidai Kitetsu is waiting for a new owner and its still on mainland Wano. Its safe to say that he could lose Sandai (a mark of shame for a swordsman) to a certain someone