I can't help but imagining a team of former warlords.
Hancock, Mihawk and Buggy team up with Crocodile and Moria. Or, maybe, they get captured and send to Impel Down. There, they team up with Doflamingo and, using Buggy's knowledge of the prison, they escape. And then they team up with Crocodile and Moria.
Maybe even Weevil joins. That way, that would keep having a major influence on the world as a group.
Other than this, what will they do? Mihawk could remain a lone wolf or join Shanks. Even though that would make Shanks' crew overpowered.
Hancock could obviously join Luffy. Weevil might join Marco? Otherwise he wouldn't have any purpose. I can't see Moria joining Blackbeard or Luffy. Buggy could join Luffy, simply to protect himself. But what about Doflamingo? Oda shows him frequently, so it very much looks like he will play a part later in the story, i.e. someone has to break him out. What will Crocodile's role be?
It would make sense for some of the warlords to bond together, as a big "fu** you" to the government, and also to protect themselves.
At least, Crocodile, Moria and Doflamingo would work. Maybe even with Mihawk, seeing as he has a relationship to one of Moria's crew members.
You know what. Screw it
Mihawk to BB's crew.
If oda really wants to wrap up OP in 5 years (more like 15) then this makes all the sense in the world. Now luffy can fight his final pirate enemy for the title of PK and zoro can fight mihawk for the title of strongest swordsman..... although u cant help but feel like he might need to best shanks to keep that title...
And if aokiji can join bb I dont see why mihawk cant.