edit for the above: since they're largely uncontested, there's little likelihood of them turning into extra possessions for the offense, right?
Love also grabs more uncontested boards than DeAndre Jordan, and some of his immediate contemporaries (and less than others, to be sure) so there's a question to be made about whether or not his defensive rebounding numbers are really an indication of good defense.
I'm not sure how whether the boards are uncontested or not affect whether they're considered an indication of good defense. I'm also not sure that grabbing uncontested boards means you're a bad rebounder. You can argue that if you can grab a board in traffic then you're the superior rebounder but I thing that grabbing a lot of uncontested boards can indicate that you're better than normal at anticipating where the ball will go after it hits the rim. While they were also good at rebounding in traffic, players like Bird and Rodman were exceptional at this. Not saying it's true in Love's case, but something to consider.
Good point. My feeling is that an uncontested board has no bearing on defense, and given that a large portion of Love's defensive boards are uncontested (unless he's grabbing it over a teammate), it's hard to defend his lack of D with 'but his rebounds.'