I thought Raina was going to kill him, too, lol.
Did you forget the part where Garrett busted him out from jail, saving him from a life locked up and totally ruined? Of course Ward feels like he owes Garrett everything. And like someone else pointed out, they said it was six months in the wild, raiding camps for supplies and such.
Oh, wait, and five years after that. Yeah, my bad. But Garrett came back for him after six months.
Oh, nice theory! After all, I don't think they've ever sold the movie/tv rights to Deviants, so they can totally use it.