Posted by ESPN.com's Bill Williamson
No matter who the new Denver Broncos coach is, there will be scheme changes in Denver, which could be a difficult transition because of the team's current personal.
Under Mike Shanahan the past 14 years, Denver was known for smaller, quicker lineman on both sides of the ball. Major changes could be afoot if the current personnel doesn't fit the new coach's system.
Denver will likely need to find a reliable, accomplished tailback. Under Shanahan, the team had an assembly line of running backs and it enjoyed great success with it. Shanahan had the most successful running attack in NFL history. Under a new system the team will likely have to find a talented back since it will no longer be able to rely on Shanahan's running system.
The new coach will have to overhaul a defense where six or seven new starters are likely needed. It was Shanahan's plan to spend free agency and the draft on defense and it will likely be the new regime's plan as well.
Meanwhile, it will be interesting to see what Denver does with passing coordinator Jeremy Bates. He was just given a lucrative thee-year deal to stay in Denver. Tennessee coach Lane Kiffin was pursuing him. Usually, assistant coaches are fired with the head coach but because Bates was just given a new deal and because he works well with quarterback Jay Cutler, there would be a situation where he stays with the Broncos.