I converted a Slipknot fan

[Helm]

No, they didn't. And yes, they do. That doesn't mean you can say anything about them. They had one, very capable drummer in their debut. As far as death metal drummers go, he's pretty cool. What you're thinking is the two percussionists they employ. And to say they're 'drummers' is silly. Bill Bruford worked with percussionist Jamie Muir in King Crimson circa Larks Tongues In Aspic, but he didn't replace him, nor did his sound overplay his skill. They're different things.