Same thing happened with the Cardinals last season. They were looking like the run away best team in the NFC while they went to 7-0 and then started to collapse in the 2nd half of the season. As I said, the Eagles are very good. But a team starting on a undefeated win streak at the beginning of a season, doesn't mean they'll be able to sustain that momentum in the 2nd half, while teams are fighting to get into the playoffs. It is a long season and the Eagles will have to avoid the collapse or losing streaks, teams like the Cardinals and Steelers went on.