The NBA Salary Cap has definitely changed the job of every General Manager into a multi-player chess game. They have to think several years in the future to keep the talent level high and the team salary within acceptable limits. So scratch the multi-player chess - this becomes more like the 30-participant version of Star Trek's 3-Dimensional Chess. And Terry Rozier is one of the pieces.
Danny Ainge has generally not been known as a mid-season trader or a rookie-deal extender.