This thread is getting a lot of re-hash since it's been going on since forever. BUT...
My guess is Lewis isn't playing more not because of injury or rules-breaking. I think he isn't playing because CSP thinks he isn't doing something right offensively or defensively. Whether that is an on-court effort thing, or a doesn't understand the system thing, who knows. But this is my guess.
CSP's roster and rotations have been an issue for a long time. Both in makeup, chemistry, and why is Player A playing so much more than Player B who is clearly better? And it's been fairly obvious since December. Why does it take so long to figure out???