All of the jiu jitsu positions are going to flow together ... The more you train, the more high-level you get, the more skilled you become, the more you are going to see all the inroads and all the transitions and passages between these different positions. And in order to be truly effective, you have to develop them. So I can't just be like, 'Oh, I've got a great half guard but, man, my back control is terrible.' You're going to have a really hard time.
--Ryan Hall, Deep Half Guard: Advanced Deep Half Attacks