On your last point, hard to say. I doubt Tim serving as our press breaker against VCU was ideal for JB.
Another thing to note is that JB likes to play two PGs together when both have a grasp of the offense.
Really, I think Brooks is the wild card here. If he's really good off the bat, he'll crack the rotation, and that's especially true if he shows some scoring ability with his three point shot.
You could extrapolate that if Brooks is really good, that could force X to the bench, but by all accounts X is having a strong offseason, so that seems unlikely.
Then the question becomes whether Poole will be good enough to force the issue and require playing time. Other than DR, I suspect he's our best three point shooter, so I think the answer is yes.
I'll also say this - I've maintained all along that MAAR, while an overall good player, is a below average two guard for any team that has deep tourney aspirations. I think he has the talent to take his game up a notch, but I also think it's fairly clear that once Zak emerged from his slump last year, MAAR was our worst starter on the floor by a wide margin. If he struggles with consistency, and one of Brooks or Poole is ready to shine as a freshman, they could easily eat into his minutes.
I see this year as being quite a bit different than years past. You literally have six guys (Mathews, Poole, Brooks, Simmons, Davis, Livers) who have never played a minute for this team, but all of whom seem to have very good potential.