Hahaha...you two...I know, that's what makes crunching fun!
Tell you what, you're going to have to both crunch separate projects, and then AGREE to start the same project at the same time, on day X in order to not have build-up affect your credit score.
I've even seen nearly a whole day delay in MW reporting before, so nothing is immune to that. If one of you switches and/or is already crunching the project before the other, it's not accurate.
Just my .02