every one of Julius Randle's teammates plays defense or gets benched (see Reddish, Fournier, Rose, Kemba etc), so you can't blame it on the guys he is playing withWhat do blocks and steals have to do with rotational team defense? Defensive stats are pretty much garbage in grading an individual defender within a team concept when that defender is relying on teammates for the scheme to be effective.
He has also played the 2nd most minutes in the NBA this season (another Thibs trait), so he probably takes breaks on D.
Those numbers tell you something since he plays plenty of minutes. Calling him a below-average Defender in the regular season is fair. BUT he may be able to turn it up in the Playoffs with days off and intensity turned up.I haven't watched every Knicks game, but every time I see them he's invisible at best on defense, and it seems somewhat noteworthy that the Knicks do far better defensively when he's on the bench than when he's on the court (117.1 DRtg when he's on the court, 109.3 DRtg when he's on the bench).