Kinda weird seeing as you are leaving out F5, which I would say is the flagship exclusive of X1 for launch.
But I am just going to say this: the KZ sales are undeserving as I view KZ 2 and KZ3 as better entries yet they didn't sell as well as this is in similar time frames. Chalk it up to a lack of AAA launch exclusives I guess.
Point being, you are trying to tell us that one game > variety. That is not a Sony gamer mindset tradition.