I just noticed in the trailer, did Victor perform a Grand Cross?
My speculation.
Since the trailer mentioned that it is only Gabe who can defeat the Dragon, plus given the possibility of a split between good Gabe and bad Gabe, what if Victor is really good Gabe?
Good Gabe (Victor) teams up with bad Gabe for the final showdown, then they all die. the end.
Then normal Gabe would wake up and say wtf I've been smoking?