Denis has a "net defense" number of -3.0 in that thing you linked. I have no idea how to interpret that.
It means that when he was on the court, KSU's opponents scored 3 fewer points per 100 possessions than when he was off. In other words, KSU's defense is better when he is on the court. You shouldn't judge his defense based off a Morningstar three and backdoor just like you shouldn't judge his offense based on 44@UT.
Oh, I agree, but I've watched his D all year....those weren't isolated incidents. He's really remarkably slow laterally for how fast he is vertically, and his help D leaves something to be desired as well (often out of position, doesn't cheat off his man away from the ball, loses track of the ball or his man, etc.).
I'm glad he isn't killing us statistically on D, but I'm comfortable in my personal assessment that he's a pretty poor defender.