Good point. I remember the old VH albums as really introducing the "when Eddie solos, he solos, there is no other guitar chording then"-fashion. That was brave as it put the spotlight on his playing, but of course he had the chops to pull it off. And the bass - while not inventive - never sounded anything less than massive on those tracks, the Godzilla stomp of Running with the Devil comes to mind.
And of course Michael's backing vocals gave VH those archtypical chorusses DLR just couldn't have provided himself (an entertaining frontman with a nice male rasp, but he can't really sing, nor has he learned it over the years). When I heard that first VH album two things struck me: the guitar and the backing/harmony vocals.