Who is the seventh Shichibukai? it's a well known fact that the Shichibukai are seven. When one of them resigns (Jimbei), dies (Moria) or goes under arrest (Crocodile) he/she is replaced for another one like Blackbeard, Law and Buggy.

So after the 2 years skip the current Shichibukai are:


Law
Mihawk
Flamingo
Kuma
Boa Hancock
Buggy (lol)


Who is missing?
The missing Shichibukai is Edward Weevil, who is introduced in chapter 802.


  Edward Weevil, or "Whitebeard Jr." is the self-proclaimed son of Edward Newgate and one of the Shichibukai. His mother is Miss Bakkin, the self-proclaimed lover of Newgate.He was first mentioned by Commodore Brannew in a discussion of the current Shichibukai ranks to several high-ranking Marine officers, but was not explicitly named until after Donquixote Doflamingo's defeat.