Zimmer brings one thing that would be an advantage, actually two, maybe three?
One, he has been HC of a team with a mid level QB and dependent on the run game and defense and that supports the team concept. That is this team.
Two, he is a no nonsense coach, which is why Parcells wanted to keep him. He is not as concerned with being liked as he is respected and his directions taken. This team has a players' owner, they do not need players' coaches. He did have a problem getting along with his OC's in MIN and that can be read two different ways. he is old school, doesn't like the pass game as the lead. Then again, he's never coached a team with an elite QB running an elite passing offense.
Three, he knows the terrain and just who the Joneses are.
That said, I don't know if he's what this team needs. But he is well respected around the league, except for his tendency for assistant coaches turnover.