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I think thats prob it! But id like to think its not that obvious and maybe....as the guy looks like hes had plastic surgery...it's Zach Young (previous seasons indicated already that he is really troubled) and he is either after Mike, for abandoning him and never telling him the truth about his mother and so on... Or he is after Gaby for not wanting to be his girlfriend... And the reason why he chose to be Edie's husband is because to make Gaby jealous (because Gaby and Edie had that fight over Carlos in previous seasons, so he might think that it could make Gaby jealous again) and to get back to her. And since he is so rich, he was able to buy the house of Edie back in Wisteria Lane and also, he underwent a surgery to change his face, so no one can recognize him as Zach... Also in previous seasons, Zach had also some serious trouble of focusing too much on people (like Julie and Gaby) and he's been violent before....