I can't believe this. I'm pretty sure they showed the replay of this "steal" about 30 times. I have a nice big HD screen. At no point in any of the 30 replays does Kobe touch the ball. It is hard to tell how and where and even if he touches PP's arm. But he clearly bangs his hand off of PP's side. Also the ball goes off in an unusual direction based on the motion of Kobe.
Furthermore, a reach in should be called almost automatically every time. It was on KG for most of the game (and admittedly those were stupid plays by KG). How you can just go around and make a totally different non-call on this play is totally inconsistent from the rest of the game.
And as for it being a great play, Kobe get beat (as he did many times throughout the game) by PP, and was making a last ditch attempt to swipe the ball away. He got doublely lucky that he both didn't get called for the clear foul, and that he managed to knock the ball away when PP was blowing right by him (again).
While I do not feel this was the cause for the game being lost, it does have a major role in the outcome, and that really disappointed me.