Often, Kuzan does his own thing. When he was introduced, he was on a bike ride and no one knew where he was. He often does things on his own terms. He's probably doing that just now, we'll just have to see what those terms are. More than likely, he probably wants to get to Blackbeard to capture them on his own terms to prevent another Marineford from happening. Akainu doesn't give a shit about BB and is letting him run amok. If Aokiji were the leader of the Marines, you best bet his ass would go after BB asap. Instead, BB was made a yonkou and let loose after what happened two years back. Kuzan is probably just doing his own form of justice, like usual. I don't see him actually becoming an actual ally to BB, unless he considers BB to be a necessary evil, and would rather team up with him to take down the current Marine status quo than ally himself with the Marines after his big fight with Akainu.
