Yes, the cache pool was a single device. And unfortunately the parity drive also died. So I'm currently without any data at all (cache, parity, and data drives all non-functional in their current state). I'm cautiously optimistic that I'll be able to recover some of the data after talking to a couple recover specialists.
I know I'm asking a hypothetical here but if I assign my new drives as new drives in unRAID (not replacements for the ones unRAID expects to be there) can I continue using unRAID in the short term as my "old server" without any of the data? Then, if I'm able to recover the data from the drives, simply pop the old drives in or clone them onto new drives, and have most of my original server as it was?