I don't have a second Wii to recreate the process lol. Kinda wish I did but I can only offer what I've already stated about it, it was about 6 months ago when I did this. I did use my own USB and SD card on both systems when I did it though, as pointed out, the SD card may be optional since it only stores the boot.dol and loader.bin in relation to Devolution. Since the DVV verification files get stored on USB and are not able to be copied without corruption it is pretty likely the USB device is the key here.
So just to reiterate if anyone wants to try it do this:
1) Have 2 softmodded Wii's
2) Rip and verify at least 1 GC game using one of the Wii's and any USB device. If you have already ripped GC games just copy one of the ISOs to this new USB device and verify that...you'll save yourself 10 minutes.
3) Plug the same USB device you just verified the game with into the 2nd softmodded Wii and load Devolution (or any loader you've setup to use Devolution's loader.bin).
4) Let us know if the game(s) require verification on the 2nd Wii. As I've stated it did not require this for me back when I did it, but I would like confirmation as to weather or not this still works. If it does I will probably add a section about it to the guide to provide a work around for people with dead disc drives/lasers.