Ryan Mallett left Michigan after 1 year for Arkansas when Rich-Rod got the Michigan job and they wanted to run the spread. I don't think Hackenberg is gone by any means, but if they hire somebody with a spread system he may have to leave if he wants to play in the NFL. Honestly, any time a coach leaves a school any kid who should be able to transfer without sitting a year as long as its not to the school where the coach goes just to stop poaching from a guy leaving. It sucks for kids when a coach leaves after 1 or 2 years and they are stuck with a complete new staff. Like if Hackenberg wanted to go Alabama he should be able to go now without having to sit out year, but the NCAA lets coaches go without penalty, but athletes need a sick relative to get away with that crap.