Danzig, Sadollah, Joe Daddy, Matt Brown, G-Sot, Manny. The list goes on. Tons of guys fight above their natural weight class on TUF. I'd imagine it'd be easier to just fight a weight class above considering that these guys have to continually make weight for several weeks.
That's true, I'm sure they don't want to be constantly cutting weight so fighting one class above is going to benefit them over guys who need to cut a bunch of times in a short amount of time.