This offseason, I’m going to look at team histories in a different way than such data is usually presented. I’ll be looking at coach and quarterback records, along with rushing and receiving milestones. Let’s begin with coaches, and start with the Miami Dolphins.
Don Shula is one of the best coaches in history. He posted a 257-133-2 record in 392 regular season games, a 0.658 winning percentage. Now consider that over the course of its entire history, Miami has played 816 games, producing a 452-360-4 record, a 0.556 winning percentage.
In this series, I will look at how each coach has changed their franchise’s career winning percentages. Here’s what I mean, using Miami as an example. We know that the Dolphins have a 0.556 winning percentage. But in games not coached by Shula, Miami only has a 0.462 winning percentage. That’s a decline of 9.4%! Shula coached nearly half of all Miami games and has well over half of the franchise’s wins. If you perform this calculation for every coach for every team in NFL history — which I did — you will find that Shula has improved his franchise’s overall winning percentage by more than any other coach in history.
The table below shows this data for every coach in Miami history. The coach who has harmed the team’s winning percentage the most is George Wilson, the first coach of the team and Shula’s predecessor. He went 15-39-2 coaching the expansion franchise — hey, no judgment here — and without him, Miami would have a franchise winning percentage of 0.576, which is 2% higher than the team’s actual winning percentage.
For every post in this series, I will post the full results in a table like this, sorted by best to worst in terms of improving his franchise’s overall win percentage. [continue reading…]