User blog comment:Kraykan/10nth member possibilites/@comment-3079795-20101121063237

Hmmmm, everyone's been screaming "Helmsman, helmsman!" since we began hypothesizing new crew members. Sure, there'll probably be a helmsman, but every Straw Hat is an expert in there own field, helmsman isn't really a skill, that's just taking order's from the navigator. . . A skill I thought they might make use of is that of a gardener. The Sunny has trees and grass and stuff, plus Usopp is going to have to grow his plants to have a constant supply of pop greens. With that guess the next crew member is probably some one yet to be introduced. ..

Hatchin would be a good guess though, he's on fairly good terms with the Straw Hats and he probably got a lot stronger protecting the Sunny during the time skip.