Obviously, loading up on 5 star QBs results in some of them portaling out, which can be OK. A freshman will sit, usually, but then he wants to start or leave. I'm a bit surprised the UGA QB2 and QB3 have stuck as long as they have, though one did finally leave for Kentucky (and may be regretting the choice).
You might snag two elite QBs in a year and really only have one, or even none.