Hate to be that guy, I love Rajon, but he isn't in the same league as Paul or Williams yet, he's definitely past Nash and Kidd in my opinion, but Paul and Williams are on another level.
He and Chris Paul both average 5.3 rebounds per game, so I would say that they are the two best rebounding PG's in the NBA. Both Paul and Williams are ahead on assists by about 2, and they are way ahead on points. Not saying Rondo isn't a perfect fit for this team, the kid is amazing, but he's not an elite point guard yet.