In a perfect world with no contracts and no egos to manage, Keon should start to balance the starting line up. However, we have a perennial All-Star in LaVine getting paid $45 mil/yr in the SG spot and Keon is not a PG or a SF.
I think it is DC's job to figure out how to get Keon 30 minutes per night. I don't think it is as important for Keon to start as opposed to getting him his minutes and having him in the game in crunch time if defense is needed. I also think LaVine will figure out how to play with the starting group and they will become a potent offensive lineup in time.