Why not make this move at the deadline? I mean, Harden was essential to their success in the post-season. He was a matchup nightmare from the standpoint he could dominate the ball, and he was probably the best at attacking the basket late in games when teams were worried about Durant on the wing.
Kevin Martin is a nice spot up shooter, but he offers little else.
Thunder will be fine, but I think the Lakers are clearly the favorites now in the West.