It is a win now league, every year is a rebuilding year. The difference is that Bill Belichick got complete control of the team from Mr. Kraft. He controls that organization and does whatever he feels is best for the team without interference from Mr. Kraft. He got the chance to put into play his vision for the team. He has been consistent in building that vision and it turned into a 17 year dominance of the NFL. He build the Gold standard for success. Not many owners are going to give their head coach complete control to do whatever they think is best for the team and run with it, so thats the biggest difference that I can see.