The first subs in the game were K'Von, Isaac Jones, and Colby Jones. So yeah, I don't think it was just a minutes crunch. He was sending a message to Keon. Which I'm fine with, honestly. He seemed a little miffed with him after the San Antonio game and they'll work out whatever it is and Keon will be back in the rotation.
The real minutes crunch will happen when Devin Carter gets healthy. You have to figure as a lottery pick he's going to be in the rotation soon and that means one of Ellis or Huerter probably won't be, at least not every night. It's something to watch for anyway.