As long as Jerry can cite the team losing a key player or two or three — be it to injury or suspension — as an excuse for failure, Garrett’s job is relatively safe.
The catch-22 is, we have both players with suspensions on their records (Zeke, D-Law, Irving and, if reinstated, Gregory) AND injury-prone players who have little depth behind them (Lee, T Smith) on this roster...so we’re never far from excusable failure.
Another thing...
Jerry Jones will turn 76yo this season and has a LOT of time and “football guy” credibility invested in Jason Garrett leading this team to a championship. If JJ were to fire Garrett after 2018, he would have to accept and admit that his formerly anointed “head coach in waiting” couldn’t get it done. At which point, he’d be halfway through his 77th year and starting over with an entirely new coaching staff and system.
Unless this team completely implodes, with NO reasonable excuses, Jason Garrett won’t be fired by Jerry Jones.