EVH goes WAY beyond tapping or speed licks (Randy does too of course), and I'd say Randy. Uli, Blackmore, DiMeola, and Schenker probably had as much influence on "shred" guitar as EVH did (maybe more), but as I said before, EVH really transcended just the guitar universe and impacted pop culture, VH was HUGE. Not to mention the WHOLE LA metal genre, EVERYONE ripped EVH off. Humbucker in a strat ? Rip off. Graphic on a guitar ? Rip off. Tapping licks ? Rip off. Modded Marshalls ? Rip off. If you don't agree these things are direct rip offs, at least admit they didn't really exist before EVH made it popular.
Also, if anything, I'd say Randy was more peeved that EVH was more well known/popular than he was than EVH gave a shit about some kid that was in his shadow. Well known QR was very bitter about their lack of an American record deal for their first two releases, and that Randy wanted out of Ozzy despite Ozzy really breaking him nationally.