I respect that syous, but I think you’re talking about people like Yngwie malmsteen (Hey I’m super fast and play the same apeggios!).
Buckethead is really creative, if you take the time to listen to his material. That’s why I refrained from using the term “Greatest guitarist” because there’s a lot to it, but when it comes to the just plain excellence in technique and creativity I think he’s among the top people.