Either your friend is not aware of his deck or it may require an option to take 8 channels. I can’t answer that for you so you need to find out from your friend and do a test.
As far as FCP goes, you need to set up your sequence for 8 channel output, patch each channel to i a discreet output and have an I/O card with SDI and 8 channel capability. Kona, Matrox and Decklink should all be OK with 8 channel embedded but firewire won’t.