I think any coach who is fired wants revenge against the team that fired him. Moore is no different. Whether he gets it or not is another story. He certainly did not do a great job in San Diego where he had a better QB than Hurts.
You don't get into the NFL if you are not competitive.
Moore is not an idiot in the Buddy Ryan, Chip Kelly type vein - say anything anytime without a filter. He is much more intelligent than that. But any Dallas fan who thinks that any past Cowboys coach who was let go form the team doesn't harbour a special desire to totally humiliate and publicly embarass the team they were released from is fooling themselves.
If Moore has us on the ropes, he and Sirianni would be more than happy to break a single game record, and put an 80 burger on Jerry and Mike.
Obviously he would do it with second stringers if he has that much of a lead, and do something conservative like run the ball, but if his offence is getting to the house he is like any other competitor in the league.