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Something is really wrong.
I don't know if that is how it's going to be.
3 down, 9th 10th and 11th seed will be in a tournament first?
https://www.basketball-reference.com/leagues/NBA_2020_standings.htmlBlazers, Pelicans, and Kings are already 4 games away from Grizzlies.
Does that mean each will all be playing against Grizzlies?
Ain't this a little unfair, it will be exhausting. Then afterward, they will be heading for the playoffs.
Please do correct me too if I am wrong.

No, they still do have to play the remaining eight games. And that would determine their playoff placement or seed. My guess, if one of those team you mentioned manage to get in 9th seed having a 4 or more fewer games to getting in the playoff spot, then the league would proceed to play-in tournament to at least have that team get their last chance on clinching in.
This is quite crucial for 8th seed team although they only have to win 1 game. You know... they need to be competitive as much as possible.