I could stop saying that Jerry hasn't done his job as a GM if other posters could stop saying that Jerry has done his job as a GM. When you hear or read a complete falsehood, it's almost a duty not to allow it to go unchallenged less people accept it as a fact.
He's built good rosters over the years? What years? How many years out of his 28 years as the GM?
Well, to put it more accurately, how many years has someone he hired built good rosters? Yes, I realize that, although he's given those responsibilities to McClay, he gets to claim the credit because he gave himself the title.
Can a GM keep his job by constantly building good rosters? What about the other two thirds of his job? Did he hire good coaches for these good rosters? Was he able to turn these good roster into great football teams, the kind that go deep into the playoffs?
Did he make the right decisions in regards to contracts and the salary cap? Did he prioritize correctly, did he keep the right players and jettison the ones whose play couldn't match their salaries?
Did he dedicate himself fully to the job with singular focus on his only goal, to do everything in his power to get the Cowboys more championships? Did he succeed?
Did he build a winning culture? Did he set clear boundaries of responsibility between him and the head Coach?
I can and will say that he hasn't fulfilled his obligation as an owner of an NFL franchise by retaining a GM with a record of mediocrity over an unacceptable span of years.