Schedule strength isn't always a reliable indicator as teams improve or worsen from one season to the next.We should keep that in mind while discussing how the 2013 schedule could shape expectations for teams nearly five months before the regular season.I do think it's interesting to note that the 2013 schedule could work against the Seattle Seahawks on two fronts while favoring the San Francisco 49ers on at least one.Could these differences help decide the NFC West race in 2013?