Blame my enthusiasm for this new NFL Network biography on growing up in southern Florida in the Sixties and early Seventies. When I was a teenager, the Miami Dolphins handed me a perfect season, which is why I’ve been loyal to them ever since. And spent way too much time and money, in recent years, watching the Dolphins play every week on satellite TV. Sigh. But here’s a profile of the coach who got them through an entire season, and a Super Bowl, without a loss.