No. Levi Brown was supposed to be "groomed", so was Brian Brohm. Neither has worked out. They were both promising college prospects, and neither one are in the league. You can say the same for Dan Lefevour who was another highly touted Bills fan "want".
Stick with Thigpen as a backup. The Bills aren't in a position to waste draft picks on "projects", especially at QB. They made their bed as far as QB goes, now they just need to lie in it. They need players. Draft someone that can fill a gap in the depth chart sooner than later.