It's my understanding that Jones forced Garret to bring someone in in 2014 because he was frustrated with Callahan and Garret's inability to get off the 8-8 schneid. Linehan and Garrett worked together in Miami, so their playbook may be a mutual effort. In Garrett's early career as the Cowboys' play caller, I thought he did OK, but he drifted, so in came Callahan. Linehan has had some success, but he has limits. IMO, Romo was a creative cook and some dishes were served hot and others cold. Not to mention the playbook was probably altered to suit some fantasy of Jerry, who was guided by his constant, 'Win Now,' obsession. I feel he has been slowly and carefully tempered by his son and Will McClay. Maybe Linehan will get his chance to show what can be done without the recent chaos, but I hope he at least puts some hot sauce in the playbook instead of vanilla!
If not, time to move on.