Huh?
1. Brees wasn't traded, it was free agency
2. It WAS a money issue, and they had millions invested in Rivers as it was, worth giving him a go... The thing was, the original prognosis of his shoulder injury was long-term, I believe the Chargers fired that doctor the year after (True story).
3. Nobody would have predicted Drew Brees being this good (As you said) so in hindsight it's kind of silly to make that statement... The year after his Pro Bowl season (Which was his contract year) he made MANY vital mistakes and didn't look like a "Top 5 franchise QB"
you might as well wait until the Super Bowl, there's only 4 fecking teams left