Why are Kelly's defensive numbers so good?
I'm seriously asking, seeing as I have a hard time understanding it. Everyone has seen him play, and the eye test almost unanimously tells us that he's not a very good defender. But he must be doing something right.
I can't think of a case of someone simultaneously having as poor a reputation as a defender and at the same time having numbers as good as Kelly's on the defensive end.
It can't just be that he plays against other teams' second units. Lots of guys in the league play against second unit guys. And if those guys are lousy defenders, the numbers usually show they are lousy defenders, despite not playing primarily against starters every night.
I do think a lot of the credit has to go to Stevens for putting him in good situations. I also, though, think we might need to reconsider the eye test on Kelly. He's too easy a target. He's white, pasty, short arms, bad hair cut, scruffy goatee, and worst of all, falls down a lot. He just looks like a guy who can't play any D. As soon as he steps on the court, it's "oh geez, this guy's gonna get eaten alive."
But he doesn't get eaten alive. Even if the eye test tells us he does, the numbers tell us otherwise. It's not only the advanced stats, the DRTG and the Defensive Plus Minus numbers, he also does quite well in the traditional defensive stats of steals and blocks.
My personal take on Kelly's defense is that he doesn't protect the rim very well and he doesn't guard the perimeter very well. What I believe he does do well is guard the lane. He's not a blitzer on the pick and roll, he's more of a drop back and read the ball handler and the rolling big. In these situations, I find that he has fairly good awareness and good hands defensively. This helps explain his very high steals per minutes stats for a big. He intercepts plays, he cuts off plays, he gets steals. Occasionally he'll come over and get a block or just get his body in the way of a driver.
In the end, I do think he has a long way to go defensively, but I don't think just automatically calling him a "terrible" defender jibes with reality.
He's already got some decent skills defensively. The numbers confirm that. And if you watch more closely, so does the eye test.