Did Xbox 360 lose an exclusive with Dead Rising 2?

One of silliest arguments made this console generation is the loss of exclusive titles. Initially when games like Devil May Cry 4 was announced for the Xbox 360, many fanboys argued that the PS3 was doomed because it was losing exclusives left and right. However, with games like Dead Rising 2 being released on the PS3, many will argue that the Xbox 360 may be doomed.