People don't really need to do this, he could of easily just left the driver part out of it and installed Windows 8 to the new SSD then installed the drivers. As long as he isn't booting off the RAID array itself, it's fine. You only need to install the drivers during setup if your going to install to the array itself.
I personally would have left it all enabled and let W8 setup see it in initial install time, what I always do on my own rig and exactly what I do with LUN mapped drives on SAN arrays presented as RAID volumes on rebuilds of servers. Never been an issue yet.
the raid config data is held and owned by the controller, same with the volumes in the raid container, windows will read it form that and not mess it up.