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Your taking issue with what you see as criticism of Kerwin? It is abundantly evident that his on the ball defense, his closeouts, his ability to successfully rub off of screens set against him are lacking, and does not have enough experience and quickness to react or anticipate his opponents moves while on defense. This is typical for many 1st year players and is a fair assessment as I see it.
He will get better as you yourself mentioned and I also believe that. While he was very important to our success last night, he also was a sieve on the defensive side of the ball, and we all certainly love to see those 3's go down, it's also fair to note that we have lost more than a few where he has hit those shots, and in one or more of those he hit 4.
Go back and read my post again, I only am pointing out how much better I think he will be in the future, and we will just have to live with his weak defense until he improves on that side of the ball.