The other problem with the logic is that K has had 9 defensive players of the year, which is 3 times more than the next best coach. Clearly the guy knows a thing or two about defense.
Also dukemom's statement about the zone working well with "the players he's had in the last few years." That doesn't even make any sense. We've had lock down defenders like C Du, Dockery, and Ewing, and had Sheld down low and before that we had Battier. All of them excel in Man-to-man (obviously sheld would work well in a zone, too)