I'm confused as to what the difference is between Live Rock and Ocean Rock, if both are essentially high calcium carbonate content porous rock either taken from the ocean or seeded in ocean water, and sold by the pound in a fish store. Perhaps your LFS
just calls Live Rock by two different names?
There is some dormant life. As long as the sand hasn't been bagged for months and months with wild temperature fluctuations, some of the Beneficial Bacteria will got dormant, and many benthic organisms' eggs will go through diapause (suspended development until conditions improve). For example, I got a pouch of Tisbe reef pods
that was expired. Nothing alive in it. But two days after dumping it in, there were hundreds of them from eggs that hatched once in my tank.