I thought it was interesting that Wells rubbed the back of his neck when he grabbed the gun to shoot Stein, as if he was remembering grabbing the bullet from last episode because he is future Barry. It made me think the creators were definitely trying to throw some misdirection at us.
They had a closeup of it, too, as if it was really important, but, as others have said, I don't think Wells is future Barry because he's in another league intellectually.
Wells is Professor Zoom as it is following (I believe it is called) the Identity Crisis timeline fairly well from what I have read.
Also, Saving Barry's mom would not prevent him from becoming the flash... Zoom did that and it had something to do with altering Barry's character but, I can not remember the exact reason at this moment. I do know that Zoom was a future fan of the Flash and that's why he traveled back in time but, his computer and knowledge of the future is really the only thing that separates him intellectually from Barry.