I believe Rick's anchor is his thumb knuckle touching his earlobe, rather than behind his jaw bone. I only raise this difference because you stated that you thought you were creeping. A solid anchor like your thumb knuckle behind your jaw bone can lead to creeping if you relax some weight on it at full draw. It is easier for me to maintain back tension with a floating anchor, like the earlobe, where my drawing hand just brushes my face, but doesn't make solid contact.
The thumb knuckle behind the jaw bone is a fine anchor, and many people use it successfully; you just have to make sure that you are maintaining back tension and not "leaning" your thumb knuckle against your jaw bone.