Really? did you look at the actual stats with Diaw covering James in a point by possession basis? Obviously not.
Diaw played 9 minutes in Game 1, a Spurs win.
Diaw playe ZERO minutes in Game 3, a Spurs win.
In Game 5 and 6 he played 23 to 27 minutes, the Spurs split those games.
You don't have any empirical evidence to back your claim.
In other words, you are wrong, Mac.