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Hero_time88 said:

There have been various bundels for Ace Combat 6 (including a Namco one), and I believe that Blue Dragon and Tales of Vesperia initially did also have bundles, so that kinda explains why those title did have better legs than some of the other title's.

Possibly, though games that also had hardware bundles (like RE5) sold over the 50% threshold 1st week.  Also, hardware bundles tend to be limited supply and launched with the games, if anything they'd logically weight sales towards 1st week rather than against it for some of those games (BD, Tales).