I'm going to guess Zelda and MK are neck and neck with MK8 (maybe) sneaking past it:
BotW: 5.7m
MK8D: 5.8m
Splat2: 4.6m
SMO: 6.2
Mario has already passed Zelda in several markets (Japan, UK, etc.) and I think will have passed it altogether by the end of the year.
With these positive numbers for first party, I think there's a good chance we'll see some million sellers from third parties this year. 2018 could even have a 2m third-party seller (which is starting to become the baseline for larger studios to invest in a console).
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