Hancock eventually comes around to someone else's ideas, if they're sufficiently well explained to him, and as long as there's some reader interest in it. He's not reliable as a first source, imho.
Of course, the same thing was said by George Bernard Shaw about William Shakespeare, that he was a great storyteller, provided that someone had told him the story first. I read that somewhere. :^) And that was before the nimrod Shaw decided that Shakespeare didn't write Shakespeare. Guess it was someone else who had a story told to him or her first...