Might that then result in having less over-all die-off on the Rock and
preserve more of its critters?

Maybe. You shouldn't see much die-off in cured live rock - that's what
curing the rock does.

The Rock is being sold as Cured---but its being shipped about 1500 miles by
Fed-Ex. I couldnt afford the dealers who ship the Rock fully submerged in
water. I figure this person is shipping it damp---so I figured plenty of
stuff would die before it reached my door. Thats why I thought my
refridgerated Bio-Spira might still be usefull to my new aquarium.

If you are planning to quarantine your new purchases (a good idea), you can
buy the first one now and keep it in quarantine.

I guess this would mean setting up a small tank with my main aquarium water
and the
Bio-Spira.? Because THAT tank wouldnt be cycled yet either
I was curious about the quarrantine thing---I understand the
avoid-contaminating-disease idea behind it---but it also seems that the
animal`s stress level would be raised by adding yet another acclimation to
its hectic life .It`s a long way from Fiji to Jersey!
So it`s stress the one to save the many.
Its starting to seem that this Marine thang is full of Catch-22s--
and us mere mortals have to choose lesser-evils all the time.