Fox has shown the ability to be flexible and get the most out of his players. Look at what Denver's staff did last year with Tebow. They revamped the entire offense in two weeks in order to accommodate a guy who's an anti-quarterback.
Granted, there was a lot of luck in the Manning thing. If Manning would have been shot then the entire team would have gone down the crapper. But they did their homework and... f it. This just sucks.