I am guessing an image made from a single drive wil not re-image to a RAID setup. But I have not tried it, so not sure. If you have an image, you can try whatever you want.
I don't have enough RAID experience to suggest the best way to get the original system back. I understand you do not have an image of the RAID?
A Windows image is fully functional and will boot. But again, not sure about your setup, but I would not add any more drives than I had to at the start.