The web of coaching connections in the NFL is nearly endless. “When you’re an assistant and you’ve been on a few staffs, you’re on all kinds of trees,” former 49ers and Lions head coach Steve Mariucci said. “It’s a forest.” But through the branches, every coach can point to one head coach who’s most responsible for helping him land one of the league’s 32 coveted positions. Here’s a look at the connections of the NFL’s current head coaches, as well as the main branches from which they came.