Wes is just as bad as Kenny, and does scumbag-y things just as often.
No, Wes isn't a threat. Kenny and Laurel will make it to the final challenge. There's not a team there that they can't beat in an Exile. And once they get to the final, it'll be easy enough to beat Wes.
He got Paula to the end on the Island, and he never threw Sarah into the Ruins. I'm not defending him as a person, but I am saying that he keeps his loyalties to those in his alliance - especially his friends. If anything, he got screwed by a friend back on the Gauntlet 3 - Evan sent him home early on.