Mario Kart is moving units
Reggie Fils-Aime, President of Nintendo America, as quoted by Polygon:
It’s one of the things I have to do with certain media, remind them, look, for us, the drive toward the holiday began a couple of weeks ago with Mario Kart 8, and that’s off to a fantastic start. For us, on a global basis, and certainly here in the United States, it’s driving hardware, which is great to see.
Sounds like I was on the right track.