Andy Reid's original coaching staff in 1999 included names such as John Harbaugh, Brad Childress, Ron Rivera, Leslie Frazier, Pat Shurmur and Steve Spagnuolo.

Frazier left after the 2002 season, Rivera one year later. From 2005 through 2008, Childress, Spagnuolo, Harbaugh and Shurmur left. All either immediately or soon became NFL head coaches, most very successful ones.

Along with Rod Dowhower's retirement after the 2001 season and Jim Johnson's tragic death after the 2008 season, Reid's staff underwent a gradual and almost complete overhaul from 2002 through 2008.

Do the names Mike Reed, Bill Shuey, Ted Daisher, Pete Jenkins, Rory Segrest, James Urban and Mike Caldwell mean anything?

They were among the replacements for that initial group of assistants. None ever became a head coach, and only Urban and Caldwell are even still coaching in the NFL — both as position coaches.

That's not the only reason for the team's gradual and almost complete decline over the second half of Reid's tenure with the Eagles, but it definitely had a lot to do with it.

Reid was never able to properly replace that original group. Whatever magic he had building from that original staff was gone. And after going 75-37 with eight playoff wins from 2000 through 2006, his last six years in Philly resulted in two postseason wins and a 50-45-1 record.

Which brings us to 2018, and Doug Pederson's staff, which I think is almost as strong as Big Red's initial staff two decades ago.

Quarterbacks coach John DeFilippo, defensive coordinator Jim Schwartz and offensive coordinator Frank Reich — in that order — all may have an opportunity in the next month to become head coaches.

DeFilippo already has interviews arranged with the Bears and Cardinals, and Schwartz is scheduled to meet with the Giants for their head coaching vacancy. We're likely to learn of more interviews in the coming days.

DeFilippo would be an enormous loss. His work developing Carson Wentz from a third-string rookie out of an unheralded football championship subdivision school into an MVP candidate in just 16 months was remarkable.