I found myself in this predicament a few seasons back. I took over a team with a SR QB and a bad backup. I redshirted the QB I signed and the following season I started him immediately and was anticipating growing pains. He averaged over 30 passes a game, threw only 3 INT's , 2 coming in one game against a top team and had a completion rate near 60% with 25 TDP. He had only one more INT over the next 3 seasons and was probably the best QB I ever had so it just depends on the quality of player he is. I don't know if he would have reached the levels that he got to if he had not started right away, probably not, but I feel I had a stellar QB for 3 if not all 4 seasons.