First just want to clarify that by saying TOV could have sold less on PS3 on simultenous multiplatform release i mean to say that
current First Week number for TOV on PS3 (in my view are) >>>> in case of simultenous multiplatform release of TOV PS3 First week numbers
Reasons are:
1. PS3 was expensive back than, so no PS3 exclusive or multiplatform game did more than PS2 iteration so far (examples include, DMC4, SFIV, MGS4 n many more)
2. PS3 was fat back than.. (size does matter a lot in Japan)
3. in case of Simultaneous release of TOV some hype n sales could have gone to XB360. (back then PS3 was never marketed much... so it could have gotten lesser marketing)
4. Game was good n it was improved further for PS3.
So i believe that delayed release of these timed exclusive XB360 titles on PS3 are going to get much better sales than what they could have achieved by releasing them simultaneously.. especially considering the first two factors.
Thats why example of eternal sonata does not count in current situation.. If game is ported n given new content n better stability (bug free) its going to get good sales.
As we have only one game example, therefore this is just my take n sort of prediction.