This is all part of Snyder's plan. Lots of people were pointing at Dana as Bill's logical successor but he wants Sean to succeed him, so what does he do? Hands the offensive keys completely over and let's Dana coach his way out of any HCIW discussion. 'Grats, HOFHCBS. Nobody in the world wants to see Dana take over now.
Probably not true, but it's fun to think about Bill as a master puppeteer pulling all of these strings behind the curtain.