His defense has been outstanding.
I find it amazing that people miss that. It might be a tad off of last year's pace, but his rim protection defense, DRPM, Defensive on/off, you name it, are all amongst the elite.
the difficulty, as always and forever, is that he has no help. Omri (surprisingly) and WCS (not so much) are the next two defensive impact guys, and then there are no others in the Top 100 in the NBA.