Smash, BOTW, Mario Kart, Odyssey. Is it likely all of these games will remain in the Switch top 10 for the systems life? Animal Crossing is another given.
I'm not a fan of ALL of these franchises personally, but I can't help but admire the strength of Nintendo's "pillar" franchises.
The 3+ mil includes digital as it was Nintendo PR, the NPD number doesn't include digital so Smash is most likely over 4 mil for the month with digital.