Harpers Island Finale Confusion?

You really should watch the show but here is why Henry is Wakefield's and Sarah's child.He was upset cause his parents never told him he was not theirs .He ran into Wakefield when the 1st murders happened and "felt a connection".He done the killings for Abby.He wanted to use the wedding to get everyone to the island and then get them out of the way.So he and Abby could live together forever (like they wanted where they were kids).J.D. got in Henry's way is why he killed him.