User blog comment:OnePieceNation/Jinbe will be the twelfth crew member/@comment-3986064-20120205193130

And how will 15 crew members get enough "screening time", I mean look at them right now, only 10 are more than enough to make some get too much attention and some get too less, that's why oda separated the crew in this last arc(most likely) since Franky didn't even appear in a chapter once when all the SH were supposed to appear and in FI he has very few lines during the battles, Nami didn't even get to fight one of the officers so seriously, 15 is going way overboard, 10 people is more than enough