Whose making excuses?
Norv has an established track-record as a great offensive mind. He's an average head coach, but at least he's earned his credibility as one of the greatest offensive minds in the game, based upon multiple teams he's coached. In fact, with his departure from the Cowboys, began our deterioration offensively. Zampese was horrible as an OC, with his 3rd and long, pass behind the chains. Our red-zone scoring started to nose-dive that same year.
Even as a HC, he's won play-off games and took a crappy Commanders team to one fumble away from the NFC championship game. He may be in a crappy division, but his team played in the AFC and played when they were the supreme conference and all the great QBs. They almost made it to the Superbowl in the AFC championship game and if it weren't for the crappy special teams the year they missed the play-offs, they had the number one ranked offense and defense one year.
To compare him to Jason Garrett is just dumb, even from an offensive philosophical stand-point. Garrett played under Norv for a couple of years max. That's it...
Even with Norv being an average head coach, he'd be much better than Jason Garrett here...