Aside from Rondo not being able to shoot, he's pretty much on par if not better than what CP can do.
That's not true. I'd say Rondo's passing and rebounding are on par with CP3. There is nothing else on the offensive side of the ball that Rondo does better.
Defensively, I'm in the minority when I say I think that they're a lot closer than others might think. I think that KG and Perk, and to a lesser extent Jermaine O'Neal and Sheed, has inflated Rajon Rondo's defensive reputation a bit, to the point where stops that are actually the work of the great rotation in the post get attributed to Rondo on the stat sheet.
I still think Rondo is the better defender, but I don't think he's on another level or anything than Paul.
He's younger, healthier and cheaper. They should focus on finding a scorer which Rondo can feed the ball to.
Rondo is 1 calender year younger, and of the two of them which one played 80 games last season, and which one played less than 70 games last season?