If you just throw the GSP covered rock in with a bunch of base rock you'd eventually seed the base rock, but with little to no decaying matter in the tank, it'd take a while. If you have harvested live rock (or any live rock that has some die off) that needs to be cycled then adding the GSP rock, IMO, won't prove to be that useful. I doubt it would die, as it's a pretty hardy little thing, and it would have little effect on your cycle time. If the GSP covered rock is your only source of seeding the new rock, then you'll have such a small ammonia spike, if any at all, that the GSP won't die off. Either way, there's not much benefit from adding the GSP rock, unless you need it, or want it, for the aquascaping.