Deron Williams could play the two guard spot and be a very good player at that position albeit not as good as he is at the PG spot ... but he couldn't play alongside Rondo. Too many diminishing returns.
Rondo and Deron both need too much of the ball and both would rather be passers / playmakers than scorers. They would hurt one another's games too much. Not worth pursuing.
I would happily consider trading Rondo for Deron ... although with Rondo's improvements over the past 18 months, that is no longer an easy question.
Rondo has cut the gap between him and Deron + Paul. Very close to their level of play.
I wouldn't say he is very close to those guys levels because he still can't hit the broad side of a barn. Paul and Deron are much better shooters then Rondo, all three are excellent passers and rebounders, and good defenders. Unless Rondo significantly improves his shooting he will never be anywhere near as good as Williams or Paul.
I'd make the trade this year, which works.
Williams, Bell, Watson, Okur
for
Rondo, Allen, J O'Neal, Bradley, Von Wafer
I'd consider even throwing in a 1st and would throw some cash if it mattered.
Gives Boston a starting unit of Williams, Bell, Pierce, KG, Perkins with a rotation of Robinson, Daniels, Davis, Shaq, and Okur with Watson and West on the deep bench. Erden and Gody go back to suits where they should be for development purposes and leaves the C's with an extra spot to add someone if they want.