OKC are a better team with Westbrook and I doubt they'd be as good if you replaced him for Rondo. They already have little offensive production in two positions, SG and C.....they need a point guard who can score. That's one reason why the drop off with Jackson hasn't been so bad even though he's not much of a distributor.
If I'm OKC, I say no. Granted, if I'm Boston, I'd say no too.