User blog comment:Monkey.D.Me/One Piece Chapter 631 FAQ (in my opinion)/@comment-1907764-20110706225436/@comment-3075024-20110707193129

The the answer is that they are old buddies. So what that they use to be enemies, at the end of the day they are the legends that one ruled the seas. Plus Shiki also had a drink with WB before he went on the Taking over East Blue Plan. PIrates of that era respected each other alot.