So you think all japanese third parties should bend over/ pledge allegiance to Sony just because? That the Sony fanboy mindset since the PS2 days and it hasn't changed one bit.
If it's not specified on a contract square doesn't have to lend any characters.
I thought the game was a celebration of Sony's own IP. Other wise you would have an Astrobot for Lara Croft, Jill Valentine, Snake, Paul from Tekken, Jon Kabira of Winning eleven, Tommy Vercetti, CJ, CD/DVD-R...