To be fair, in one of those games the Lakers beat the Mavs by 40 points and he didn't need to do much. But I will say this: for years perimeter defense has been Dallas' Achilles Heel, not Dirk Nowitzki being bad in the clutch. Tracy McGrady, Steve Nash, Dwyane Wade, Baron Davis, Chris Paul, Tony Parker in succession have all raped the Mavs in the playoffs. With Marion, Stevenson, etc, we finally have a number of quality perimeter defenders. You'll never stop Kobe from getting his 30, but you want him to take 30 shots to do it, and taking jumpers instead of driving to the basket, drawing fouls and getting your bigs in foul trouble.