I don´t mean that we have seen his best, I mean I feel like we now have a clue what his ceiling will be and it appears, to me at least, to be limited.
If he is not going to be a damn good, efficient pocket passer who can reliably get the ball down field and limit turnovers, than he needs to be able to be a game breaker with his feet, either to buy time to scramble or to get yards downfield running for 1st downs. It appears to me he is not either, and will never be more than a good game manager (hopefully with fewer turnovers).
Given deficiencies elsewhere it seems we need a gamebreaker at QB if we want to punch above our weight class.
I see your point and I by no means believe Sefo is an elite college QB. I do, however, believe he is a talented, smart player that is going into his 3rd year in a QB friendly offense that has improved dramatically, compared to the rest of the team. I think he's going to have a really good year in '15 and the offense will continue to make strides, but the W/L improvement is going to come down to whether or not the D is improved and able to cause more turnovers. At the end of the day, I just don't see another QB being able to do a whole lot more than Sefo, with the defense CU has had the last 2 years.