How bout have Manu play 48minutes so that the other 11guys can be in a rythym? We have been saying that for years. It comes down to this, Spurs always have to find guys who can play with Parker, when they can't the answer is "lets stick em with Manu". FYI - RJ doesn't cut because that's not apart of the set plays or the offense. He gets the bruce Bowen treatment, stay in the corner.
When it comes to RJ playing better with Manu than he does Parker, thats simple ( Manu looks for him in spots he can be effective). Thats what Manu always does, which is why Blair in his rookie season was able to score so easily when running the pick n roll with Manu. When he tried it with other guys it never worked out as smoothly.