Wow. Either this arc is moving extremely quickly, or Oda has a shit-ton of story planned for Fishmen Island.
While I'm not trying to have Zoro's babies like SOME people (*cough*Daz*cough*lol), I am happy to see him lead a faction of the group against one of the main bad guys of the arc. I would've much preferred to see the crew remain seperated, so that each could take down a member of Hodi's crew (as you'll recall, they are currently going to different parts of the island to take over), but I suppose the old adage of cutting off the head applies here.
Also, Decken is seeking out his own beatdown from Luffy. I honestly do not see him being a challenge to Luffy unless he can get in a touch and turn it into a long-range battle. The "main fight will be underwater" is becoming more likely with every chapter!!!