Talent doesn't vary THAT widely from team to team. What you need is a typical roster bolstered by a few playmakers, preferably one being your quarterback. And then you need a coach who can put the team in a position to succeed, and teach them how to do so. For instance, you don't ask a bunch of road grading offensive linemen to zone-block, it doesn't play to their strengths.
Consider what Harbaugh did out in San Francisco, since it's been brought up already. He doubled down on his defense, which is where his playmakers were. He also had Frank Gore, but he was saddled with Alex Smith under center. So he basically puts in a bunch of quick passes, and when he needs to go longer he has Smith roll out so he only has to track half the field. In short, Smith is put in a role that maximizes his strengths and responds with an amazing year. Same talent, but coached differently, and different results.
Then there was the Front Office work. Since Harbaugh's arrived he has turned over half his starting lineup. It's not like he's upgraded at every position, he's just put in pieces that he thinks will work better in his scheme. And it's really starting to show on the field. That's a different part of coaching, and time will tell if he's as good at it as he is the tactical, but early returns are promising.
The Panthers have plenty of talent, and Rivera is very good at teaching. He has a teaching staff as well. I don't think he worked well with Hurney, which is why Hurney was at a loss as to why the Panthers were losing early on--he thought he had given his coach the tools he needed to win, and it wasn't happening. So now Rivera is getting the tools from Gettleman, and it will be interesting to see if that pair works better. Hopefully, they will be, and hopefully Rivera will be better at the tactical part of his job next year.
Nothing else to say.
Coaching and front office can/does matter, and bring out more or the best of said players.