The article is mainly about David's influences, so that implies from a time before he was famous, and learning to play/write. Mark came a long way after that, I am sure David would say Mark is a great player and he likes his music though, as has been said, they know each other, it is the sites opinion, more than directly from David though, so I think Mark would be in there. They don't mention BB King either, but it is well known how much David thinks of him.