I, on the other hand, think that Vince was the guy who proved that it has to be both. I certainly am not going to deny that he got the most out of the people he had to work with, but he was responsible for bringing in a lot of the dynasty players. Check the '59 roster
http://nfl.packers.com/history/all_time_roster/players/, paying special attention to how many of the eventual stars had more than a year or two under their belts at the time. The jump in production from '58 to '59 may well be attributed primarily to coaching, but 'Lombardi's Packers' were most definitely a combination of talented players acquired and a coach who got them to play their best.
We can never prove one way or another.
I believe it is 75% coaching and 25% talent. I would argue that you view those players as talented because Lombardi was a great coach. I think if lombardi had 20 other players instead of starr, Nitchke, adderly, davis, wood etc, we would be talking about players whos names have been lost to history. And if Starr was on the Lions and Nitchke was playing for the Redskins their names would be unheard of today.
Im not saying that a coach doesnt need talented players, im saying that there is a lot of talent available to every team. Many players come into the league each year with measureables like some HOFers. So why do only a few suceed and others do not?
I recall Forrest Gregg saying he thought he was good but agter a few practices of Lombardi yelling at him he doubted his skills. At his low when he thought of quitting, Lombardi rold him to hang in there and he would be good. After that, Gregg dedicated himself even more and said he would run through a wall for him.
We have all had bosses we would do anything for. We have also have had bosses we despised. What a difference it can make in our dedication and efforts. And in the NFL, a very little improvement in 11 men on the field can have large impacts on a play, on a game and over a season.