It's foolish to compare dumping Nolan after fielding the #31 defense in the league and Moore who when the offense especially Prescott was healthy they were the top offense in the league. I don't know if you have some agenda with Moore but I seriously doubt that the ice is that thin under his feet.
As far as your question about McCarthy, with a healthy offense that won't be what gets his ticket punched, it will be the defense if it doesn't make a lot of gains and if the defense forces the offense into shoot outs because the defense isn't getting the opponent's offense off the field.
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Moore, this has nothing to do with him other than I do think Booger sees him as the future HC of the Cowboys and I think he's been sold on that by Moore's fans.
There is this air of mystery around Kellen Moore. They release all of the coaching staff, including Moore, and he's already accepting the Huskies OC gig and moving back home and after a 12 hour interview in which McC convinces the owner to hire him as the HC, McC is singing Moore's praises and asking him to dump the Huskies deal and come back.
Now, I am assuming here so don't anyone come punish me since I admitted that up front.
Put yourself in McC's position. He's out of the league and not in high demand and gets the chance to interview for the DC HC job along with other names being thrown about. How is he coming to that interview? He needs and wants the job and has enough information to realize this amounts to a personal services contract to the owner, not unlike what Belichick, Gruden and Rivera have.
He is well aware of Booger's remarks about Garrett making him comfortable so he knows what he has to do in order to get him to call off the search and hire him. Make Booger feel comfortable with the future with McC as the HC. No wave making, no headline seeking and no upstaging of the most self-important owner in all sports.
I think he wanted to convince Booger of 3 things. 1) He was amenable to a flexible contract, 2) he was a huge fan of Dak Prescott's and could take him to the next level and 3) he was a Kellen Moore fan and would like him to be his OC. I think he went into that interview to sell one thing to Booger, comfort.