I left my nucs a bit too long last year, kind of forgot them. They were a single brood frame, with a mated queen, working on foundation. Made my rounds and they were plugged full of brood. They did a great job of drawing out the foundation. There were many that had been preparing to swarm. I stopped it by finally transfering them to single brood and releived the brood nest a bit, and put them to work again on foundation.
It would of really pissed me off if I had let them swarm on me.
I think in a nuc there would be adequate srores and reserves to successfully rear a queen. I figure the porportions would be just the same as a bigger colony.