It’s true that AVR’s pack a lot of options and a lot of amps at astonishing price levels as compared to ’high end’ stereo.
In your friend’s case, he paid for 7 amps but he probably uses only two, that’s a pity.
The Denon has the option to use 2 of the 7 amps for bi-amping the front speakers. If you can show him how to do this he’ll have even better sound out of his B&W 603’s.
He can also run his HDMI cable via the Denon and use his AVR together with his TV to enjoy great TV sound.