The NFL doesn’t allow college football players to enter the draft until they’re three years out of high school. That may be the only reason UCLA quarterback Josh Rosen is still in school.

That’s the word from UCLA coach Jim Mora, who told Albert Breer of TheMMQB.com that Rosen is good enough that he could have been a first overall pick in this year’s draft and could be a first overall pick in next year’s draft. Rosen won’t be draft eligible until 2018.

“His potential is unlimited,” Mora said of Rosen. “He would have been the best QB in the draft this year. There’s no question about his ability, only experience and, at this point, maturity. He’s special. And he is smart, a leader, and very well respected by his teammates. He works hard and gets it. Just needs to continue to grow and not think he’s arrived.”