i still think that his accomplice is Sully.
Even after watching episode 11 and Shea and Madison 'finding out' that its Jimmy i don't believe it. If you try and tie it in with Harper's Globe, the person helping Wakefield has
to be a frat boy, and the only two fratboys left are Sully and Danny.
Robin was responsible for the deaths of two frat boys and Sully wants revenge on her for that? maybe they were his friends? This has to be true because none of the other male characters have been to a college in the USA, Cal is English, Jimmy has never left Harper's Island, neither has Shane, so it has to be either Sully or Danny, assuming Henry didnt decide to kill his own bridal party.
In Episode 11 Wakefield tells Chloe that he nearly died for a woman like her which could mean that Sully's relationship triangle with Chloe and Cal is similar to the one
had between Wakefield, Sheriff Mills and Abby's mother.
Wakefield could have kidnapped Chloe for Sully and thats why he didnt kill her
cause Sully didnt want him to.
Also notice how Sully's friends Danny and Booth have not/were not murdered.
Booth has accidentally died and its surprising that after so many episodes Danny is still alive, as he isnt a very important character.
The reason why Malcolm was killed (and so violently) was because Sully found out he hid Booth's body and took the money, which clearly no one was happy about.
I don't know whether Sully has actuallty done any of the killing himself, but he's definately helped Wakefield, who must be his father.
ALSO notice that Sully has never slept with Abby! which is odd seeming as though he sleeps with everything humanly possible.
So all in all, Sully is Wakefields son and the accomplice :)