I just don't think there are many situations left in the NFL where there is a GM who can survive multiple coaches and, in many cases, even if they have that authority, the owner tends to be a powerful force in that organization. That is what make the NFL quite different from the NBA where there are a lot of powerful GMs who are the bosses of their organizations (Daryl Morey, Sam Presti, Pat Riley, Rob Pelinka, etc)
Mickey Loomis, Brian Gutekunst and Jason Licht are the only three guys I can think of. None of these guys to me have a presence in their orgs like a Pat Riley or Daryl Morey