Sam Webb interviewed Brandon Peters' father.
http://www.wtka.com/2012/09/06/podcasts/
I'm just pasting a summary from MGoBlog because I'm not going to listen to it.
The Patterson family were the ones to reach out to Michigan (we already knew that)
Harbaugh sat down with each of the QBs and commits to explain the situation
Michigan initially passed on Shea as they did not have a roster spot open at QB
After Wilton informed the staff about his grad transfer, Harbaugh reconsidered Patterson's interest to transfer
David Peters said that Michigan NEEDED ANOTHER QB for depth so of course they should go after the best available
David Peters said that his son was raised to compete and not run from a challenge
Brandon said that he doesn't care if they bring in 30 more QBs, nobody is taking the job from him