Talk to the older guys.
When GB won there 3 championships in a row, Horning and Taylor were gone. GB relied more and more on the passing game. Go back and look at Starr's performances in clutch and playoff games, he excelled. Clutch and playoff games is where Brett had his struggles. And he had some major struggles in playoff games.
Brett = Great regular season QB, not so great in playoffs.
Bart = Great clutch and playoffs. When it really counts.
Go look up the post season/clutch game stats. It's not even close.
Sorry, as great as I think Brett is, Bart > Brett.
Edit: Pretty cool you working in the GB organization.