There is certainly a philosophy about draining the clock that makes complete sense. IMO, I would employ this at the end of the first half OR if the score is tied at the end of the game and we are going for the "go ahead" score.
While time was a factor. There is nothing "lucky" about our Defense holding our opponent Offense (#8 ranked scoring in the league) to a NET 2 points in half a football game (on the road)
A broken clock is right twice per day. His reaction time in addressing issues is comparable to the flow of molasses.
There's also the question of emphasis. Jones would have been low on the Dallas priority list. There's tape now showing he must be accounted for. That's fine if it creates more passing game opportunities, with play action for example.
I would expect Montgomery to remain the starter when he's ready to come back. However, besides the running, that Jones layout catch on the sidelines should open eyes to dual-aspect potential. Neither of these guys are good pass blockers in the third aspect of the running back skill set.
That was more about the Packers offense taking over and limiting Cowboy possessions. And even with the Packers offense doing almost everything right, The time of possession was 35:06 for Dallas, and 24:54 for Green Bay. I saw nothing from the defense in that game that encouraged me. Aaron Rodgers being almost perfect, A lucky bounce into Randall's hands, and one or two mistakes by the Cowboys saved the game.
