My experience in the hobby has told me base/dry rock just needs a simple rinse and add to the aquarium. Dry rock causes no cycle @ all. The Live rock with organisms from bacteria to pods, worms etc... dieing is what you need to worry about.

Put it this way if it was a fresh water tank and you added a pile of dry rocks would you worry about a cycle? No you would not, its not any diffrent with saltwater.

Seed the dry/base rock with about 25% liverock and over a period of months the dryrock will be just as live as the live rock.