The entire scouting staff was gutted when Jimmy Johnson left. Ackles, Mansperger and Wooten were all gone. That had as much to do with any of that as the coaching changes. Sorry, you cannot tell me for a minute that Dave Campo was a player in the draft room.
Since Jones is incapable of independently judging talent, he depends on who speaks the loudest.
From the looks of things, he is listening to his old cronies just as much as he is Jason Garrett. You hear the man from practically every draft since Garrett has been on board referring to one player or another (and even coach hires) being attributed to the likes of Lacewell and Switzer.