I brought this up because Sully gets major production when he gets his minutes. It also helps his development to get as much experience in a year where grooming our young players should be our biggest concern.
I would argue that he gets his minutes when he gives major production. Right now Sully is still pretty inconsistent. Some of it is because of injuries, sometimes matchups, I think he has had tired legs at times, a number of times he has been in foul trouble, and some of it is just being young. But there have been plenty of times when he simply wasn't playing that well, and Stevens has gone with more minutes to players who were playing well.
Chris, I think the data might support your view.
First, let's start with the fact that Sully's per-36 production is higher when he plays >30 minutes. These are per-36 points and rebounds, and shooting percentage:
>30 19/11 on 47%
<30 14/10 on 36%
Here's where it gets interesting. Coming off the bench Sully's numbers are higher overall (again I'm showing per-36 points and rebs):
Starter 29mpg, 16/10 on 41%
Bench 21mpg 20/10 on 47%
So, it's clearly not as simple as "start him and play him a lot of minutes, and he's productive." It's more subtle, and I think you can see Stevens' role in bumping his minutes when he's playing well, and cutting them when he's not playing well.
You can see this by looking at situations where Sully starts but Stevens cuts his minutes, and situations where Sully comes off the bench but ends up playing more minutes. I think in both case these are situations where it's likely to be the coach's call based on how Sully is playing, rather than a preset role.
For instance, Sully has two games this year where he came off the bench and played 30+ minutes. His per-36 figures in those two games are 25/11 on 55% shooting.
In contrast, when Sully starts and plays <20 minutes, meaning that Stevens has elected to pull him after giving him the starting nod, Sully's per-36 numbers are 15/10 on 39% shooting.
As Chris says, I think Sully still has ups and downs. But it looks like Stevens is doing a good job of giving him lots of minutes when he's being productive. I think the numbers fit that story better than a simpler one where his production just goes up when he gets a bigger preset role.