User blog comment:Bovell/Black Ops becomes top selling U.S. video game of all time/@comment-3479648-20110316033500

Here's how it works: CoD 7 outsells 6, 8 outsells 7, 9 outsells 8, and Infinity Ward makes a new type of CoD, Treyarch does one more BO and continues different games, and then we'll get a third developer.