Here's my take:
You have to understand - these guys, when actually playing and for the most part, were moving @ 185+ bpm the ENTIRE SHOW. First off JESUS CHRIST!!! that's not easy!! second, I think the show design was brilliant. Instead of 135ish kids huffing and puffing after tearing **** across a football field, we have 135ish kids that can't be heard huffing and puffing b/c of the vocals. It took the audience attention off of the beaten down hornline/drumline, and on to "where in the heck is that voice coming from"?
Now thirdly, give 'em a chance, do you know how frequently corps shows can change? You saw them July 21st in SA, but finals was the second week of August. I mean geez, the corps I marched - we changed our ENTIRE SECOND HALF OF OUR CLOSER between prelims and semis (yeah, div2/3, but still).
And after all that, I still must claim this: I hate vocals. They take away from the show. But the Caddies did a PHENOMONAL JOB in pulling it off... except for the homosexuality of the actual lyrics...
It's funny, next time you watch the show do this: after the narrators complete a sentence, add "because I'm ****" at the end. Hours of sheer entertainment.