I think it is simply how he was able to get the team to play close to what were the expectations at the beginning of the season. And he does not have Allar or Rojas to help him. The fact that we actually look like an offense that has an identity and the defense can actually sack the QB and make some disruptive plays. He also was able to get better play out of the O-Line.
I do agree with your premise, though, that first, the competition has been weak and second, it is not like he has implemented some genius coaching strategies, he just did some very fundamental things. The bizarre thing is Franklin could not do it which tells us he had given up on the program and/or there were extenuating circumstances we don't know about.