I can tell you that Tommy Brasher is a great hire. He was the defensive line coach in the Hugh Douglas, Corey Simon, Jevon Kearse, Derek Burgess... days when they were going to the NFC Championship every year and putting those guys in the probowl, and helped Trent Cole early on at the beginning of his career. After he retired, high draft picks Jerome McDougal, Victor Abiamiri, Trevor Laws, Brian Smith, etc... all turned out to be busts while guys like Jason Babin and Chris Clemons did nothing with the Eagles and then went on to play great for other teams. He came back to the Eagles at the end of this past season to clean up the mess made by Jim Washburn and did a respectable job. Former first round pick Brandon Graham was being called a bust until Brasher came back and Graham picked up 5 sacks in his last 5 games. He's a very good defensive line coach.
The problem is, the last time Reid hired a defensive line coach before hiring a defensive coordinator, it backfired and he was forced to hire Juan Castillo because nobody wanted the job. They all wanted to bring their own guy in.