Parcells hired Sean Payton, Todd Haley, Tony Sparano, Todd Bowles, & kept Mike Zimmer (With the Giants, Parcells also recognized the talent of Belichick and Tom Coughlin).
Jimmy brought his quality coaching staff from University of Miami to Dallas (Wanny, Butch Davis, Joe Brodsky, Hubbard Alexander, Tony Wise, & later hired Norv in 1991, & Hudson Houck in 93).
In Dallas, smart independent head coaches know how to assemble a solid coaching staff, evaluate bright young coaching candidates, & tell the management side (Jerry) to stay out when assembling a coaching staff.
When Jimmy & Parcells were running the team, assistant coaching hires were good & solid.
Jerry's picking of the assistant coaches and the overall coaching staff is a joke -- his constant meddling & imposing in the football operations of the team is a failure for this organization.