If we are being honest, Brad probably was and should have been. Brad's job is to win games for the U of I. Playing Kofi in a manner that would improve his weaknesses wasn't conducive to that end, which is why this move made sense for both parties.
If Kofi came back, he would have been used exactly as he has been the past three seasons. Kofi was dominating at this level without the skills the NBA execs would like for him to develop. He was not going to be challenged physically the way he will be playing in the NBA, or more likely the G-League. If he is ever going to be a NBA player, he has to learn to be effective against guys who are similarly sized. They just don't exist in any number at the NCAA level.
Practicing against a guy like Gobert (arguably the best defensive player in the world) is just what the doctor ordered for Kofi. He needs to be challenged. NCAA ball wasn't providing him with that.