Judging from the clip of the final show, I think they've basically shown the winner.
My money is on Tom. Why?
They sit down in one brief shot, then sugar effectively points at 2 of them, fires them and then turns hard to his right (Tom's position) and says "you're hired". Much more blatant than usual.
Also, Is it just me or does anyone else notice how little Nick has done? Every task he blends in to the background and complains that everyone is "doing it wrong" but never takes charge himself. Ultimate weasel.