I've seen a lot of QBs being considered or on the roster, bashed because they're "never going to be Drew Brees." I was in San Diego for the early 2000s, and I remember Brees' first few years. He wasn't that great.
The Chargers acquired Rivers and were hanging onto Brees because Rivers held out. That's when Brees exploded.
This is my long way to say that maybe the book shouldn't close on Brohm or Edwards yet.
http://armchairgm.wikia.com/Drew_Brees