It's not just 4-5 star QB's that transfer out when they realize they're not going to be starting.
Kansas lost three QB's in the offseason this year:
Montell Cozart (2*)
Deondre Ford (Juco)
Ryan Willis (3*) - Virginia Tech
http://sports.yahoo.com/news/montell-cozart-becomes-third-kansas-qb-to-transfer-235431729.html
Rutgers also lost three QB's this offseason:
Chris Laviano (3*) - San Diego State
Hayden Rettig (4*) - Tennessee Tech. Transferred to Rutgers from LSU in 2014.
Michael Dare (3*)
http://www.sbnation.com/college-foo...-hayden-rettig-mike-dare-transfers-rutgers-qb
All the more remarkable that Brook hung around when Tommy was starting. Think of what might have happened if Brook had transferred. Boy, was he special in so many ways.