Possible but I think Mihawk is Witch.
In Day 2, he wrote a pretty solid post about why Trafalgar was not Rebel Leader, and when he got to the part about Citizen, he just wrote "I doubt he's Citizen" as rationale. Seems like he just wanted the mislynch. Though if Urouge flips CP9, I'll probably feel safer around Mihawk.
He's already explained this but I felt it applied to my argument.