1) It isn't only Xbox that's bigger; they're all bigger for October. Switch by 52k, PS5 by 28k, and XS by 99k - and our Switch figure ended up being much closer to NPD's in the end.
Yep VGC had Switch USA numbers at about 712k in October, then Nintendo announces official figures that they sold 711k, so tracking for Switch was exceptional. So trusting Ampere's estimates that say Switch was over-tracked by 1.8m somehow as of September 30th doesn't seem like the right course without further information to back that up.
Gamerscore:20,000 - Trophies:3,800 - Nintendo Awards: -1
My Xbox Series S is my baby. It grew up into an X.