Much better to bring in two QBs, let them compete, and if the "loser" isn't willing to take the faithful backup role, help him find a place where he can fully pursue his dreams. A program can also build a strong brand with that kind of reputation.
The problem is always matching evaluation to production. You recruit on measurables and evaluation of character... but you can't know who is going to be able to master the mental side, see the field, make quick-correct decisions, AND deliver the ball to the right person with accuracy in this offense!
I mean, our staff had Milton and Hooker in practice, looking at them everyday, and everyone agreed (including players) that Milton was the clear starter going into last year's season opener. It wasn't until both had been in game situations that everyone's first hand evaluation proved inaccurate.
So for those reasons I think you have to bring in as many top QBs as possible, because you just don't know until a game is on the line.