As to who actually claimed them as an influence, I'm not sure.
I read that at a concert a dog jumped up in front of one of their speakers and its guts liquefied from the sound waves. That's heavy man.
If Leigh Stephens wants to remain relevant he should release an anti-mask song that is to Clapton's what Vincebus Eruptum was to Disraeli Gears. But who will be the Blue Cheer of Man Morrison's?