You could make a good argument that Washington was the defacto DC here this year. He was listed along with the other coordinators on the Bills coaches' roster. He took the press conferences that the DC usually takes. He was involved in game planning as the associate head coach. But, you say, he didn't have that title!!! Well, the league only defines the position of assistant coach and head coach. It doesn't dictate that any team has to call someone "coordinator." Other teams have "coordinators" that did the same work that Washington did here, but you usually see it on the offensive side of the ball. So I would argue that Washington was as much of a defensive coordinator as Brian Callahan was an OC in Cincinnati or Mike McDaniel was in SF.