User blog comment:TheDoctor230/Flash Season Final Theory (Spoilers)/@comment-3221148-20160513110715/@comment-3221148-20160514065029

Where was it said that the traitor will specifically "join Zoom"? All I could find was the phrase "...a surprise double-cross will leave Barry shocked!"

A "double-cross" is a pretty broad statement, so Wells betraying the team's decision to spare Hunter and trying to get revenge could be one.