If you look at the stats you quote here though, and only these stats, it’s pretty clear Lewis should be playing ahead of, say, Nixon right?
I'm not excited about either but one of them has to play to give people rest.
TH, Bolton and Jackson get the majority of guard minutes. The fourth guy plays just enough to keep those guys fresh. If Nixon were to fit into a roleplayer role of tough defender, take care of the ball and shoot only good catch and shoot 3s then I'd prefer him to be the guy.
I'm not sure if the reason he continues to play like a volume shooter is coaching (no one has told him to knock it off) or him (he just shoots anyway).