he actually said that because it sold most in Japan that means that exclusives sell better??? It being exclusive means nothing, it is a cultural phenomenon in Japan. By the same token i can say it's the lowest selling FF since FF4 in Japan, and that is also a fact. Both are terribly misleading.
Tekken not selling anymore has nothing to do with it being multiplat, nobody wanted tekken anymore. It used to be popular, but popularity fades and Tekken hasn't changed all that much since the PS1 days. You can say this about so many games, Virtua Fighter used to be a million seller in Japan, and VF4 sold 750k in Japan, then VF5 can't even break 100k.
There are examples of games doing better because they are exclusive, but that is difficult and risky. The gamecube had some games like that, but that doesn't mean you should start making tons of exclusives. There were far more examples of games that would have sold better as multiplatform.
currently playing: Skyward Sword, Mario Sunshine, Xenoblade Chronicles X