User blog comment:Ricizubi/Do you believe that the 10th memeber is Shirahoshi? or Jinbei?/@comment-41.212.159.33-20110727205637

Think it should be someone that has the same characteristic as the Blackbeard crew and that has utility to the strawhats (doctors, cook having joined) and must be weaker than the top 3 members (Luffy, Zoro and Sanji) pretty sure jinbei is stronger that Sanji that just remove him. Only one person comes to my mind, Shirahoshi. Her sizes matches the giant from Blackbeard crew and provide help in the crew greatest weakness the sea.