They'll take on more smoke if you don't let them sit out. Not to mention, the cuts are so big they won't change that much temp wise in an hour anyway. I wouldn't worry about it.
I can't wait to see some pics. This is a huge cook! Good luck!
YOU WANNA THROWDOWN?
You should! Fun and fabulous prizes await you!*
I have a bunch of stuff that cooks meat outside using some form of combustion.
*Actual prizes may not be fabulous. It all depends on what your definition of fabulous is. You're not going to win a car or anything, so don't get your hopes up. Just trying to give you realistic expectations.