I think of all of those that left our program for whatever reason (NFL, attitude, playing time, academic, team rules, etc.) Turner's departure should be the most telling.
If he transfers to another D1 and has a very successful career that is very telling.
If he transfers to another D1 and is mediocre-to-does nothing that would be very telling.
If he transfers to a non-D1 for football that is very telling.
If he never plays football again that also would be very telling.
I'm not sure how much affect this will have on RR's tenure at UM, his success in continuing to recruit Ohio, etc., as this fall's W/L record will decide most of that. However I think Turner's future will be very interesting with regard to RR and his staff and how they manage a program.