McDaniels would not have much inside knowledge of the Broncos anyway. Since he was fired, the Broncos hired new coaches. He might know a bit about some of the players, but that is really it.

Loophole? Nope.

Fair? Sure.

Advantage? Likely, the Broncos as the Patriots are having to change OCs mid-week.

Anytime an assistant gets another job during a playoff run, it throws a wrench in their former team's chances.