PR has every shot at winning this year and here's why I believe it:
Sweeping all music captions and deservingly so. Been a long time coming in my opinion. (Just a tad biased here )
Visual is their weakness, but here's the key: GE Vis is third place, but Visual sub captions overall were 5th. So, the drill and visual design package is effective even with "dirt" in the feet. Clean it up and the GE Visual will go up as well. If it were reversed (Visual 3rd and GE Vis 5th) then there would be a major problem because a relatively clean marching corps can't be effective. We'll see what happens tonight at Atlanta, but if these scores hold true, PR is in an awesome spot to be in.
Now, for my conspiracy theory... I believe that this is the weekend (Murfeesboro/Indy historically) where, if slotting does exist, it takes place. Not neccesarily in the sense that Corps A will get 4th now and at finals, but more like the judges will say, "BD and Cavies, 1-2, then PR, CC, Cadets, will compete for 3-5, and SCV and Bluecoats will compete for 6-7" Basically, major leaps will happen tonight and then for the last two weeks they will be grouped to fight for certain spots. Contenders for the title will be separated, all the way top to bottom.
That's my personal conspiracy theory (aka $0.02)