If I was the thunder I wouldn't even dare, Perkins>Green. It's rare to come by a centre which can possibly have a garnett/tyson chandler effect. Their defense had become avg last year, it can change this year if they keep Perkins in.
and the rondo vs. Westbrook thing, I think Westbrook is in a good place with the thunder, no need to start fucking stuff up and do a test if Rondo fits better, chances are it wont work as good. This is so not going to happen, Thunder are on a good road imo, this will screw it all up.