Its the logical next step up the coaching latter. How else would you get coaches besides recycling the same guys around the league? For all those failed head coaches, their are plenty successful ones that were coordinators.
They choose them because they what an improvement or emphasis in that area of the coaches expertise and think that coach can lead the team to similar success that they had at the previous job. Nothing illogical about that.
Also McCoy was pretty impressive as a coordinator with a TE playing QB last season, or as impressive as he could be.
This post was edited on 1/2 at 12:29 am