Muddy Walters " apologies if some of these people may not be considerd " great thinkers" On the contrary i think Bill Waterson and Charles Schultz are excellent suggestions. If you must apologise I would suggest it's not for including " Muddy Walters" on your list.
So yes I think my heroes and artists like Picasso and entertainers like Buster Keaton can deservedly belong on the list of great thinkers.
The Rebel.