This is purely speculative, and it's second hand info from a dreaded "inside source", but anyway .... a good friend of our family runs a company that employs some player during the summer, so he's fairly "in the know" ...
According to him, Lee has been like a zombie since the second interception against Alabama in November. Even in practice apparently he's just not there mentally and the staff has been trying to "find him or reach him and he's just not there." He claims that had anything happened to Jefferson injury-wise, in the SEC CG, the staff was prepared to go with the #3, Zach Mettenberger, instead of Lee. Not sure if there's any truth to this but it wouldn't shock me. They both lacked mental and emotional stability throughout their time at LSU, so it's almost fitting that this is how it ends. Like most fans I'm just relieved to be done with the both of them and am looking forward to the Gunner Kiel era.