Re: Randle's defence, he did improve last year on that end of the court, he's no longer a negative. But I do want to stress that his defensive metrics are inflated by the Knicks having no viable defensive backup at PF: his 'replacements' in adjusted +/- metrics this season are defensive legends Taj Gibson and Obi Toppin, which adjusted +/- has no way to account for (APM usually works well because teams typically have players who're closer to replacement level, but guys like Gibson and Toppin are probably some of the worst defensive PFs in the league).
Edit: Gibson weirdly has insane DAPM values this season, but play-by-play data has him playing at C a ton so I guess it's Toppin who was Randle's backup this season.