Fantasy football is not a static process. While there are great players like Tom Brady, Le'Veon Bell, Julio Jones and Antonio Brown who can string great performances together on an every-year basis, there are stars like Adrian Peterson who suddenly lose it, and there are sleepers who step up their games in an unexpected way.
Finding those sleepers is often the key to having a winning fantasy football season. Scouting up-and-coming players is vital in fantasy football, and while luck may be a factor, understanding a team's game plan, personnel and coaching tendencies are all key.