I guess it depends on each individual person's definition of "statement game".
My personal definition is essentially a game where the doubt has officially been eliminated that a team is for real and a legitimate threat to contend for a championship.
I personally don't think it took until week 16 on Christmas Eve for that to happen with the Saints............though that game certainly brightened most of our holidays, for sure.
I guess the "downside" of a good season is that usually it involves multiple scenarios to choose from, when it comes to this sort of thing. Just like in 2009.........there were the Washington and Miami comebacks......not to mention throttling the Giants in a game where both teams were undefeated...........but at the end of the day, most people are gonna say the New England MNF game was the statement game of that season.