This same situation describes Tates transfer from OSU. Tate was not pushed out of OSU, they just didn't fight to keep him. The same can be said for Jarren, which has been reported from several media outlets.
I believe the reason cited was that OSU didn't fight to keep him. At this point, it is pretty obvious that Miami does not plan to play Kosi. I haven't read about the NCAA cracking down on waivers, that is interesting if true.