Yes. Also keep in mind the stat from that graph isn't per game, it's a cumulative stat. If two players are both equally bad, but one of them has played twice as many minutes, then he would have twice as bad of a score. So Cade is benefitting from having missed a lot of the season. On a per game (or per minute) basis Cade is much worse than both Suggs and Green, according to this TPA metric.
Hrmm.... I miss Kelly for sure! But we needed something defensively to pair with Wood/ Sengun - if the plan was to draft Mobley, then keeping Olynyk would have been a no-brainer; but after getting Sengun, and having Wood - it was a matter of choosing which way to go, and Wood is probably better than Olynyk defensively (which is a terrifying thought as bad as Wood is defensively).
Silas and the Rockets are morons for not playing this guy more. Play him as much as possible to develop him. High IQ player.