I think the snaps with the first team this week in practice are mainly due to the fact that this is the best opportunity Phil will have to get meaningful reps in a game with first team starters. It is really unclear as to how much time he is going to get with the first team, but I would venture to say that he will get a healthy amount of snaps, probably more than Ian does (both 1st team and 2nd throughout the game). Why would you not want to use this chance to let Phil work in with the 1st team? If something were to happen to Ian we would need him to be ready, confident and prepared to do so. His lack of in game experience with the 1st makes this the obvious chance to get the most reps. Besides you have more to gain playing Phil than Ian in a game like this where you are likely to win big. injury chance goes down for Book, game experience goes up for Phil, win win.
As far as saying "If he (Ian) does not play well than Phil will overtake him" well to me that is fairly obvious, you want the best guy out there, it does not take any kind of journalism or creative thinking to make that point, its fairly obvious. I think that it is unfair to assume, especially without you being in building or at practice, to say that they are using this as an opportunity to let Phil overtake Book. I think it would be unwise to base Phil's success off of one game against bowling green as a factor to replace Book as the starter.
Point being, Ian Book is the starting QB for the foreseeable future and the staff along with Kelly have made that clear. Everyone is always looking to improve and Ian is in that boat, don't use that as some kind of knock against the kid. He is taking care of the ball and winning games. Sure i would love to see him play better, be more aggressive downfield, hit Kmet on the seam when he is lined up Z, learn to avoid pressure in the pocket while keeping eyes up field, but he is getting there and we have not seen the best of Ian Book yet this year! ( I mean the UGA game was not bad Ian Book. Finke could have/should have caught that ball. Flee flicker int was a great play mixed with, imo, poor play calling given the situation. 29 for 47 275 yards 61.7% 0 sacks, 2 TDs & 2ints, really not a bad game what so ever. Lets get the run game right and see what this kid can do when the offense has a more balanced attack. PA, 2 TE sets, we are yet to see a lot of this so lets just slow down before we deem him a liability to win games. there are 10 other guys out there we need helping him).
There are plenty of big games yet to play, and chances for him to lead this team to a 11-1 record.