User blog comment:Drkdragonz66/Treyarch - Call of Duty Heading to Next-Gen Console?/@comment-2224289-20111010112938/@comment-5485267-20111010231004

Its like that because, when one developer(Infinity Ward) has already done a game it will be out of money so a B-team(Treyarch) develops another while the developer who made the last game recovers in money to make another game. I'm not sure, but I believe its like that.