For all the people saying they don't want a shoot first PG, well that's exactly what D-Rose is. The main difference between D-Rose and Westbrook (and why there is a perception difference as well) is Rose is the best player on his team and Westbrook is 2nd. Westbrook does shoot a lot obviously since he scores a lot, but he has made some nifty dishes as well.
I doubt OKC would trade Westbrook stragiht up for Rondo, and you're dreaming if you want them to include Ibaka as well.
The C's need a primary scorer and Rondo will never be that. I don't know if Westbrook is the best fit but he would supply that extra punch. None of the big 3 can be the primary scorer any more, though they can bring it on given nights. And not only is Rondo a below average shooter, he won't even lay it in half the time after he has beaten 2-3 defenders and gotten deep into paint.
I think the C's are way too easy to defend now which is part of the reason their offense dropped off significantly later in the year (other reason was no Shaq). Without Shaq, you lay off Rondo and basically play a 4 or 5 man zone (depending on whether you need to guard the center) against the big 3. I hate to say this, but even a guy like Bibby made Rondo look like a fool by just zoning off him.