Kaboul is an aerial machine. Not the greatest along the floor sometimes, but with King alongside him who excels at that, he's a great CB partner to have.
It all relies on King though. If he picks up a niggle, as he usually does, then it all comes crashing down.
Yeah, we have the same issue with Distin+Jags, although he hasn't been himself lately. Distin is good, but having Jagielka alongside him is a massive boost to his ability.