Individual defense is such a hard thing to evaluate, especially for guards (for bigs you can just kind of go off blocks and rebounds and be in the right ballpark). Even advanced stats are not great. Evan Miya, for example has KB as the 6th best defender on the Illini, #69 best defender in the Big 10, one spot behind BH in both rankings. Now, if you've ever watched an Illinois basketball game, this result is absurd (even though I think BH is a better defender than he gets credit for, though he is inconsistent). A little off topic, but it's this kind of stuff that also makes me doubt the accuracy of any of Miya's algorithms and causes me to shudder whenever I see him quoted or referenced on here.
TLDR: it's best not to put too much stock in any All-Defense team as it remains very hard to judge, individual defensive stats are bad, and therefore voters are forced to vote largely on either bad stats or vibes.