Brett Favre - Green Bay Packers - Mike Holmgren - Steve Mariucci - West Coast Offense - Ron Wolf's GM'ing - Bob Harlan* = Jay Cutler (or Bubby Brister or Jeff George or ......) .
Anyone who thinks Brett Favre would have become BRETT FAVRE!!!!!!!!!!!!!!!!! without all those elements subtracted above is being absurd. There's no way on god's green earth Favre would have become what he was as a the backup in Denver (and then literally Bubby Brister) behind Elway or (likely, starting in 1993 anyway) third string in Kansas City (behind Montana and Dave Krieg). Those were the only two other options Atlanta had on the table when Wolf sent the first rounder down. In short, it was the three years of patience and instruction by Holmgren and Mariucci that made anything out of Favre. Holmgren told Favre (in Favre's own autobiography) going into the 1994 season, that anymore of the 1993 stuff and he wouldn't hesitate to pull him. That year, in the Minnesota game, after Favre came out with a bruise they left Brunell in to see what he could do. THAT's the kind of stuff people forget about Favre, even after 2.5 years, that is what doesn't make comparisons to Cutler absurd.
Unfortunately, way too many people gave Favre all the credit, as if he was some otherworldly demi-god who blessed us with his presence. The reality is he was a Jay Cutler who got swept up into the vortex of all the OTHER positive things that were happening. It was a mutually beneficial instance that Favre's durability and longevity met up with the top-notch training that made the results we saw. But believe that if Favre wallowed on the bench in Denver or Kansas City, there would have been no realization of the latent potency or longevity. Favre would have been back at the Broke Spoke circa 1995 regaling the regulars with tales from the NFL, for beers, waiting to take over at Hancock High. There would have been way too many new QB's coming off the college football assembly line circa 1994,1995 to waste time a former third stringer turned second stringer. Favre's chances would have been used up. The best thing to ever happen to Brett Favre was getting traded to the Packers. Unfortunately, after a decade of getting proverbial reach-arounds from everybody, Favre thought he should have been running the team, and we all saw what transpired once he started going over the edge as far back as 2005.
*Setting everything in motion starting in 1989.