A lazy answer but the truth: I'll let the coaching staff that has forgotten more about football than I'll ever know, that sees every single rep thrown by these guys, and that has previously shown that they are willing to pull an under-performing QB make that decision.
Obviously I want PJ to take the starting job. That means he's better than Book, which has exciting implications given his arm and athleticism. But calling for PJ to start or for Book to move on based on the information at hand is basically just wishing that PJ would be better than Book. It's putting the cart before the horse in a way that only fans are capable of doing. We're not comparing Book with PJ, we're comparing Book with our idealized version of PJ that probably does not exist.
The most recent II podcast gave the best comparison by saying that PJ is like Andrew Hendrix when Tommy Rees was our starter. People were clamoring for Hendrix because he had a big arm, was athletic, and had previously shown some flashes of both in scrimmage-like situations. Then he comes in for a whole second half against USC and everyone realized that Rees was the reason we had an offense at all.
Bottom line: There's a reason the starter is the starter and despite what most people on here bemoan it's usually not that the coach feels bad about benching the older kid.
