When you hold a team to 16 points, you should win the football game, I remember Bronco and his watermark for his defense, when they held an opponent below 24 points and didn't win, he blamed the offense, of course, that only happened a few times in his entire tenure, and it has happened 3 times this season, which from a purely statistical perspective, reflects pretty poorly on the offense.
I am kind of on board with you on the running the ball issue, if he thinks they should have run more, he should be making that happen during the game, otherwise, it is on him as the HC.