Don't get me wrong, I'm just speculating. I Forgot about thief. I'll give you that one. Grand Theft Auto 5 certainly was on top in September, but in my defense, I did tack on "if not from other companies".
But kids actually do buy and play the newer KH games(though many may have been introduced to it by older family members). It's happened a few times in my local area. And you can't deny that-even with the complicated plot-the games still try to appeal somewhat to younger demographics with the humor, atmosphere, and-in some scenes-tone.
Of course, with NA release dates for this series, it could just be a case of "why fix what ain't broke". Doesn't quite explained the decision for DDD. Once again, just speculating based on some apparent patterns. I'm open to other possibilities.