It's probably more with regards to set-up in the studio rather than the drums themselves, mic placement, etc etc. For consistency it's best to set up and leave it, changing a mic just a little bit can drastically change the sound.
I doubt they would tear down in the middle of drum tracking. Mangini may have a 2nd kit for live use, but even then, they'd be paying for studio time all summer when they're not there. Doesn't make sense.
I'm going to guess that they've wrapped drums already, and are ready to record the rest when they get back.