^ Ditto on O-Robi. It's a great design. Also nice to see Robin getting to do some infiltration and espionage, since that was always supposed to be her specialty after all.
I kind of like the anti-climax of the whole "Nekomamushi is going to seek out Marco" story angle. It's just a few pages where Neko sails directly to where he already knew Marco was, and Marco just says no. At least one thread gets tied up.
Marco being the crews doctor surprised me. I always assumed he was the Zoro to Whitebeard's Luffy, not his Chopper (probably should've seen that one coming since they're both Zoans). For a character that inspires so much fanwank from the fanbase we really didn't know much about him.
Well, considering how incredibly sick and unhealthy Whitebeard was at the end of his life (remember, in his first appearance he was hooked up to oxygen and multiple IVs) it does make a sort of sense that the doctor of his ship would become the closest to him.