But Smash is probably around 15m already.....The Lat of Us Part 2 will be the biggest exclusive in this list, in my opinion. The PlayStation has an incredibly large install base. Don't settle for anything under 15 million copies.
Pokémon will sell 15 million copies or more if it's any good.
Halo will be on PC for the first time in years, but it will also be on Gamepass. Don't think it will be close. ~12 million is my guess.
Those were my predictions out of thin air. No problem.