User blog comment:AYET/The CONVENIENT Talk About Chapter 713/@comment-10923326-20130704104631

Yup, definetly should be a backstory for Issho, he is just so insanely strong but that always happen, strong characters always appear out of nowhere. Anyways, speculations on his backstory: maybe he was an ex-pirate or as mentioned by Ranger94, he could be a military leader in one of the peaceful kingdoms.

I also see the possibility of Violet joining the SH, most people seems to be thinking that (the folks at Arlong Park and some people here), although they've thought the same about Monet joining the Straw Hats which didn't happen. It's been so long since a new member has joined the Straw Hats, it'll feel really weird if a new member joins but I'm sure everyone will get used to the new member, both in the crew and us One Piece fans.