How the hell is this possible? MW2 > WSR for Full 2009 NPD Year

[Mr. sickVisionz]

MW2 wins the battle but loses the war.  According to VGC, WSR has already outsold MW2 in the US.  I think WSR will probably be one of the Top 10, if not Top 5, selling games for all of 2010 whereas MW2 won't even be on the list.