The Hendrix point is well made. There is a greatly revealing little out take track with Hendrix hamming his way through some tune in various ersatz blues characature voices. It's on "Crash Landing" I think or (more likely) the bootleg version of same.
I seem to remember one former pop star slagging off another former pop star about his aversion to Magma becasue they were "jazz" and not in the critically approved rock pantheon like The Velvets et al. Goose gander. Cope can obviously say whatever he likes and we can like what he says (or not) but the Blues is the foundation of more musical forms than those of a staunchly post punk persuasion might care to admit. For example Is there a finer blues singer in the art rock idiom than say Beefheart, Polly Harvey or David Thomas? And what is "I Need Somebody" if not a blues?