BlackBuzzard
Banned
You're not taking into account that they're also a publishing house and help to develop some other Sony games. Somebody already posted a full page of the work they've done, but you can check on Wikipedia yourself.
They probably had like 10 people working on each of those projects. There were also some pretty big duds among the games they helped with, like Starhawk,PSASBR,Datura and Sorcerry.
Who knows maybe they were spreading themselves too thin. Thus effecting other projects.