What are the twelve "big-hitters" for the first year you are referring to? Genuinely curious.
I am as well. Here's everything that I've seen even mentioned thus far:
1-2 Switch
Arms
Disgaea 5 Complete
Dragon Ball Xenoverse 2
EA Sports FIFA
Fast RMX
Has-Been Heroes
I Am Setsuna
Just Dance 2017
The Legend of Zelda: Breath of the Wild
Mario Kart 8 Deluxe
Minecraft
NBA 2K
Puyo Puyo Tetris
Rime
Skyrim
Splatoon 2
Super Mario Odyssey
Skylanders Imaginators
SnipperClippers
Sonic Mania
Steep
Super Bomberman R
Syberia 3
Ultra Street Fighter 2 The Final Challenge
Xenoblade Chronicles 2
Out of those, the only strong contenders are FIFA,
BotW (and even that's questionable, recall that not a single Zelda title has broken 8m units and only one has ever materially exceeded 10% attachment),
Just Dance (hasn't had a strong attachment rate since the Wii and rarely exceeds 1m per title today),
MK8 (best-selling Wii U title but attachment averages around the high 20s) and
Super Mario Odyssey. Honestly, I feel up in the air about
Odyssey. The knee-jerk reaction says, 'oh, Mario, gonna sell like crazy!' Except that look at the top-ten main-series Mario titles: only three of the ten (#7, 8 and 10) are 3D titles.
Everything else on that list is either unknown, a title that's been released for years, or has sub-3% attachment or worse.