Zoro isn’t going to get a solo adventure after the crew beats their last opponents. If Zoro fights Mihawk, Luffy has to fight someone that same arc.
Shiryu is the biggest issue with BB as final villain
I'm not saying that. What I’m saying is that no Straw Hat will achieve their dream right after the crew defeats the Blackbeard Pirates. This holds true no matter which final opponent or faction you believe they'll face.
What I’m talking about is just the last real crew vs crew battle.
Zoro can fight Mihawk after that.
It could take place right near the end, during the final rush to Laugh Tale, when it's probably just Luffy and Buggy still in the game.
I agree that Shiryu isn’t the right opponent to fulfill Zoro’s dream, but right now no one is except Mihawk.
No one seriously thinks Imu and his puppets are more dangerous than the crew of Xebec’s successor. And no one who’s really been paying attention to the story can believe Imu won’t fall to Teach.
Blackbeard will only be complete as a character and as a villain once he achieves what Xebec couldn't.
Imu was the antithesis of Joy Boy. It's the classic yin and yang, light versus darkness.
Imu vs Joy Boy, Xebec vs Roger, Teach vs Luffy.
Teach is the shadow of the third world, just as Luffy is its salvation.