I
To be honest Oda should have just sticked with Zoro vs Mihawk instead of Admiral, lame decision to turn their relationship into student/master
Mihawk fighting against the Straw Hats in the middle of the Final War doesn't make too much sense
unless it's like Baratie again
they are kinda on the same side, but Zoro just goes up to him and says
"It's time, let's do this"