He falls under the Joe Flacco category. He threw six touchdowns, one INT and threw for 900 yards in three playoff games that year. It's the same type of fluke as the Broncos defense going completely ham and scoring touchdowns throughout the playoffs. Weird things happen in the playoffs.
The best way to build a longterm, contending football team is by having a Top 5 quarterback. You won't win the Super Bowl every year, but if you reach the divisional round of the playoffs year after year, the chances you win one or two are much better.
As to the passing yards, that is another statistical anomaly. It is not a causation argument. If you lead the league in passing it does not exclude you from winning the Super Bowl. There's no correlation or causation.