Would he come back? Would Benford want him back?
Why not, for either question.
Forrest, who's prior competition was rural west Texas 2a teams, has NBA aspirations and needed to go some place where he could get extended playing time for a season and refine his game. He now has that at South Plains, a school where 6 players from last years team alone have developed to the point that they've received D1 scholarships.
Benford's job is to put the best possible product on the court within the guidelines set by the NCAA. If a player of Robinson's stature and ability is what North Texas requires, then certainly Coach Benford and the North Texas family would welcome him back. Forrest Robinson would bring many advantages to North Texas because he is already familiar with the university and its support systems. The coaching staff and many of the players would be new, but there would be much that he was familiar with.
It is not a personal issue for a player that gets limited minutes in his freshman year to spend his sophomore season at a juco to improve his game. Neither the coach or the player should be offended as nobody turned their back on anyone, and if the player develops he usually has a lot of options after juco.
What is far worse is when a player that does not receive much playing time as a freshman stays, never develops to his potential, and is permanently relegated to the end of the bench for the duration of his college career. This doesn't benefit the player and ultimately hurts the team by denying that scholarship spot to a more able contributing player.