Campbell doesn't have a system, he has an attitude.
He also has a GM who absolutely stacked his team, both sides of the ball, in addition to two top coordinators one of whom (Johnson) is the most coveted coach in the league.
Imo, Campbell has BOTH System PLUS attitude.. There's an Identity with the Lions.
And that's both at home and on the Road
He has imposed elements as a HC, and in his coaching staff on both sides of the ball.
His coordinators (and asst coaches) have emerged as top of the ranks in the NFL, primarily in OC Ben Johnson and DC Arron Glenn.
If he can avoid the over-aggressive, trick em play and questionable decisions in final moments of critical games- (and luckily to avoid key injuries).. he's gonna advance that team to a SB appearance.
You're absolutely right. - More so Campbell has and is backed by a terrific front office management team.
One that not only sought and hired Campbell himself, ...but they have and are constantly building, upgrading that team roster on player personnel , on every level of player acquisition .