I'd say he's near enough the frontrunner now if not already. Most Valuable after all and he's kept us in there in all the games, whether won or lost.
Not only that but Ryan is losing ground to him as the only man who could be ahead. Rodgers has a better rating (by.4) and 2 more TDs but a 6TD outing will tend to spike that. Manning's stats are better than Ryan's (better rating, same TDs, less picks) and he's been consistently awesome throughout so far. Ryan's team is 6-0 but losing their swagger a little, lets see what happens as the season goes on.
Statistically, Peyton Manning has been the best QB in the league so far. Fact.