While Brees has had an incredible season so far (3,832 yards, 33 TD, 11 INT), the real story comes down to Favre and Manning.
Favre and Manning are tied for the NFL record in MVP awards won. Although they each have won the award three times, they technically both have 2.5. Manning won the award in 2003, 2004, and 2008. However he shared it with Steve McNair in 2003.
Likewise, Favre won in 1995, 1996, and 1997, but he shared it in 1997 with Barry Sanders.
Therefore, by splitting one of their awards in half, they each have 2.5.
Brees is still searching for his first.
Manning has the Colts at 14-0 for the first time in franchise history (third time in league history: 1972 Miami Dolphins and 2007 New England Patriots...both teams finished regular season undefeated) and is riding a 23-game winning streak.
Favre has undoubtedly earned the NFL Comeback Player of the Year and has led the Vikings to more wins this season (11) than they won last year (10) with three games left.
Favre has thrown for 3,341 yards, 27 touchdowns and 6 INT, while Manning has thrown for 4,213 yards, 33 TD and 15 INT.