Jurkovec could be awesome, but we really don't know at this point. Book should start the spring as the starter for a lot of reasons
-Book played well enough to get us into the playoff last year
-Book was a first time starter last year and most QB's show their most improvement from first year starting to their second year starting
-Terrible precedent to replace a successful player with an completely inexperienced player without at least a competition when you have the opportunity to have a competition
-What Jurkovec brings to the table in terms of composure and going through progressions is conjecture at this point, it isn't high school anymore
-With all of spring practices, individual work and then fall camp, Jurkovec has plenty of time to beat out Book if he's really ready
-With limited QBs on the roster, there are plenty of reps to go around in Spring to give Jurkovec the chance to win the job if he's given a real chance
I'm not disagreeing with you about Jurkovec having a higher ceiling, but he's very inexperienced at the college level and there is time enough for him to win the job before the season begins if he's really better. In the long run, he will probably be better, but that might not be this year. Assuming he's going to come in and be at a level of Lawrence or Tua is a big leap of faith. Despite Kelly's track record, last year he did show he was willing to make the change when he thought Book provided us with a better chance to win. I think that if Jurkovec is given a real chance then we are in good shape. If he wins the competition, then he should start, if not, then Book stays the starter and, hopefully shows improvement. The key for me is that Jurkovec has to get enough quality reps for him to have the opportunity to win the job.