I read your post and it seems as though you did not read mine. As far as FFXIII hype goes we have not had any information about the game for some time and contrary to popular belief most game sales come from the casual crowd whom do not visit gaming forums. SE will need what? A month of solid advertising of the game and it will sell a huge amount no problem. If it does release this year no doubt the game will get its release date by TGS which is next month.
More than enough time to hype the game through the roof and looking at the development cycle of FFXIII SE will want it to sell very well in Japan. How much of an indication are pre-orders in terms of sales?
Anyway I have no doubt FFXIII would outsell MH3 first week and lifetime in Japan. One would have to be brave to bet against that. Also people would do very well to not use MH portable sales as an indication because MH3 does not have the main selling point of the portable titles. Personally don't even think MH3 will get a second shipment.
