Ok, maybe I'm confused about this cycling thing but from what I understand, if you use liverock that has already been cured in a new tank, then a cycling might not occur.
See
http://reefs.org/library/newbiehelp.htm#curing
Quotes
"If you start a tank with cured live rock (if truly cured and lacks large clumps of plant or sponge or the like material), then no cycle may be witnessed. If livestock is added slowly, the bacterial populations increase on demand without stressing the system."
So it won't surprise me if there aren't any spikes since where would the sudden ammonia come from for a spike to occur? The reason for adding livestock slowly to a new tank with cured live rock is not because an ammonia spike is guaranteed to occur, but because there may not be enough bacteria on the rocks to handle the bioload. But then again, maybe there is in this case? We don't know that since we don't know where the rock came from. I wouldn't be surprised if everything goes fine.