You are right, and I worded my post poorly. What I meant to say is that 12 shots should be about the floor for Peter in every game. When he's hot, I think you could see something closer to 17-20.
I absolutely think Peter will average more shots per game than Jarrod averaged this past year. We saw throughout Uthoff's career that he was a little reluctant in taking on the leading scorer role. Jok has never been gun-shy, even when he was a freshman. Jok does not have elite athleticism, ball skills, or size to simply shoot over people, so at times he struggles to create good looks for himself - however Jok's quick release is elite which means he can get off a lot of shots in tight spaces, even if he hasn't created much room for himself.
The main thing I could see limiting Jok's ppg is his playing time. Pete, at times, has struggled with his conditioning as I believe he has an acute case of asthma. Uthoff averaged nearly 32 minutes per game last year, and Haluska averaged nearly 35 minutes per game his senior season. I remember Alford strategically used timeouts in that 06/07 season to give the starters a rest as we had a short rotation of players. Fran is notorious for disliking to use timeouts, and he has shown that he is not afraid to use a lot of bench players. If Peter doesn't average more than 30 minutes per game, then I think he tops out around 18 ppg.