Note that online pools are typically 16 or 32 man brackets and NCR historically receives over 50 emergency registrations, including many top players, Choi explained in his official statement. So it is your choice if you want to wait to do emergency registration, pay more money, and gamble on this final bracket being smaller in number or lacking seeded players.
Pools for the three aforementioned titles will all run on the same day to avoid players gaming the system and waiting for an easier bracket. Adjustments will be made should the tournament receive zero emergency registrations, but we all know how unlikely that is.
Of course, this also has its downsides, notably for community members who cant reliably plan for a tournament months in advance. Coupled with the already steep costs of emergency registration, this move could likely prohibit some players from attending the tournament altogether.