Mm, no, I think you're wrong. I'm speaking purely from retail perspective here; Across just the one district, XV has over 300 preorders on the PS4, and 10 on the XB1, and KH3 has over 200 on the PS4 and 10 on the XB1. I wouldn't be surprised if those 10 are the same on both games.
The US is the primary market for the XB1, yes indeed, but the audience buying the system isn't showing any consumption of Japanese games, or even broadcasting forward reaching interest in them. These companies do use preorders as a metric for showing potential interest, you know.
Last generation, the market for the 360 and PS3 was very different, the impression in the US was a significant disparity. That doesn't exist now, and we've seen a minimizing of what demographics are buying which console. Rather than a console for a wide range of games that the 360 still sold to, it's largely become just shooters, racing, sports, and the huge multi-plats like Assassin's Creed.
What insight we're getting is that Japanese publishers are trying to push the PS4 even more now. Microsoft showing up at TGS would be irrelevant anyway. They have no market power or pressure for Japanese influence, less so than ever before.