Castillo underrated star of coaching staff

PHILADELPHIA -- Here are five observations on the Philadelphia Eagles, based on their practices Wednesday and Thursday:

1. Near the top of the elements that have kept the Eagles among the NFL's most viable Super Bowl contenders is the continuity of the coaching staff. Andy Reid has assembled, and maintained, an all-star cast of assistants, and the big-picture significance of that cannot be overlooked. All three of the coordinators -- Jim Johnson (defense), Brad Childress (offense) and John Harbaugh (special teams) -- are among the league's premier coaches in their respective areas of expertise. Assistant head coach Marty Mornhinweg is a onetime head coach. The staff of assistants, hardly the league's biggest but undeniably among its best, averages 10 years of NFL seniority.