The perfect Cowell-type guy would be "Johnny Rotten", and I really mean that. After all, he even admitted that back when he was with the Sex Pistols, he was an ABBA fan. He would definitely be brutally honest.
Didn’t he have a show on VH1 at one time? Yes, I agree - John Lydon would be awesome but I’m sure he’d never do it!
Jello Biafra?