The problem I have with Blackbeard's crew is that aside from him (and maybe Burgess), we know nothing about them. I have no reason to want to see a match between Zoro and Shiryu. At the same time, I don't see any scenario where Mihawk would become an enemy (same with Shanks), so I can't see Zoro fighting him.
Hopefully that bald Gorosei guy is a badass lol.