Successful coaches (at every level) go into a game knowing as much as possible about everyone involved in the game...regardless of what that person will be wearing. I saw this on the high school level with basketball. I HATED making a 3-second call...if you wanted to take yourself out of your teams offense I was going to let you...until someone gained an obvious advantage. I called it one night during the girls half of a varsity double header. The coach (the winningest high school coach ever) yelled at her post player "If he is making that call, you were in the paint for a long time. Move your rear."
Officials are human, they have things they seem to always call. They all have different definitions of advantage/disadvantage...even though it may be slight. Leagues have points of emphasis. If coaches are going to put his players "in the best position to be successful" they will know all of that. Doesn't mean the head coach has to know it...but the DB coach should know it for those officials, the O-line coach for his players, etc.
