Spags uses zone quite a bit, actually. Of the zone calls, he prefers Cover 2 Zone and Cover 3 Zone, but the key is that he mixes things up based on who we're playing.
This graphic is just through week 12 but you can see we're not strictly a man team by any means. Miami and Denver stick out as calling more man defenses.
I love the Baltimore chart where you can exactly which game they played KC on how much they changed their tendency.
