Todd, the comment I heard at the CBJ class I was in was that if someone turns in chopped brisket, the ASSUMPTION would be that they're trying to compensate for overcooked brisket. Fair assumption or not, I personally consider it dangerous to try it. If you're worried about overcooking your brisket, cook two... or three... and turn in your best sliced product. Just my opinion mind you.
KCBS Member #14287