Big shoutout to Will Barton for doing what CJ couldn't off the bench against the Spurs..putting points up at a lightening clip. I don't get CJ getting Will's minutes when clearly, Will is the better spark plug at this point.
I think it depends on what role the coach wants at a given time. If you want someone to work for his own shot in garbage time, Will is the Thrill, no doubt.
If you want someone to blend in with Mo and the other players on the court, I think the coach goes with CJ to give him some court time to get him some experience. CJ is a good and willing passer. Other than his current shooting slump, CJ will generally not hurt you nor take the ball out of other players' hands.
Mo is supposed to be our instant offense guy, and main assist guy off the bench. Will does one of those at least, but the coach clearly has more faith and comfort in using Mo for that, and as a distributor. CJ is also a better distributor than Will.
But again, if you want to plug someone in who can get a shot off against just about anyone, it's Will.
I don't think it's so much Will v. CJ, as it is Will v. Mo. Even with Mo out, Coach has a certain idea of the mix of players he wants, and I don't think it generally involves a guy whose strength is one-on-one basketball. When it does or if there is a match-up advantage, by all means put Will in. He's fun and effective.