There's a thread on reddit where the topic is Monster Trio vs Admirals. The OP makes the typical arguments for which admiral Luffy, Zoro, and Sanji will fight. However, the funniest match up was in the comments. Apparently some people are predicting Zoro vs Greenbull. How does this one work?
Greenbull is a big unknown for now, any prediction is based on headcanon at the current point of the story.