Keldon Johnson is the longest-tenured player on the roster, and you'd think that his stature would give him a leg up in rotations, but it's not going to work out that way. The sixth-year guard/forward will likely see his fewest minutes since his rookie season, and that may eventually cause him to seek a trade out of San Antonio.
The Spurs have the deepest roster they've had in a long time, and it's forcing KJ down in the rotation. He's improved his defensive focus, but he still isn't great at it, and his offense mostly requires getting downhill and scoring in the paint.