Build on strengths not changing for the sake of changing because u can. THAT IS what makes a good coach. It's ok to put in a new system as long as the players have synergy to the system. If u have a player that is great at blitzing the qb u don't put him in coverage. U don't take a 320lb lineman and have him run outside man. THAT was the problem Nolan has had in the past is wanting players to adapt to his system because he says so. Build on what u have is the moto of the story. And if u bring in talent, make sure that talents fit what u are trying to accomplished and not hinder ur teams grow. Don't keep players that aren't building blocks for success. Continuity is IMPORTANT. Build on that continuity.