I think you're in the minority on that. They did miss a beat - and the playoffs that year. Granted they were 11-5, but only had the Dolphins as competition in the AFC East. It was a team loaded with talent and FA's. But without Brady, there were a foot note. Take Brady out of the picture the last several years and Belicheat would be a solid winning coach with a great FA and owner to help. He uses the player's talents well. He's a great coach, but he's not a genius. I'll also point out that the glut of his assistants haven't panned out all that well. They would have if they had taken Brady with them.
We'll see when Brady hangs them up.