That pick and roll duo is pretty much unstoppable. Cousins getting the ball in motion with the ability to either bully his way to an and-1 or just rise up for a 3 is really really hard to defend for one thing. But then you add a point guard like Rondo who can deliver the ball on target in tight spaces and you're talking all-time great potential. Stockton-Malone territory. I miss the old bulldog Rondo on defense though. If he locked in as often as he did his first 5 seasons we'd really have something special. I don't think it's a physical limitation with him on defense, I think it's more about conserving energy.