You will want some circulation even in the oven, but, far less than in a smoker. I would be tempted to finish the briskets in the oven once foiled, and let the butts cook in one WSM through to completion. A WSM dialed in, you can get a few hours of sleep at a time.
the meat thermometer was so far past the top reading, it read Taylor
"perhaps...but then again...maybe not..."