Rees was having his unquestioned, complete offensive control revoked at least wrt Freeman having veto power on calls.
I base this on the post pick 6 bowl comments. If there were hard feelings, this might extend to dad….I had no inside info that I was referring to though - sorry about that.
I hope that he stays and wish Rees well. It is ironic that Rees will have very little independence under Saban relatively speaking, but he will take that from Saban.