We left our stuff at TC, leaving the tents open (as mentioned above) in case any curious critters came by. I did see a few running off with an entire bag of freeze dried food from a nearby campsite so we made sure everything was buttoned up tight in the bear canisters. Unless you're looking to make a quick exit after summiting I wouldn't think breaking your camp down is necessary.
Not much wind to speak of during our stay so we really lucked out there, but we left our packs in the tents to add some weight.
I kept any valuables with me in my day pack so I wasn't too worried about any theft.
