He didnt attain enough, he attained enough to beat a stamina drained/ hole in the chest Katakuri who lost the will to fight and stopped using many of his abilities mid way through the fight.
Honestly it was more so talking about the possibility of Kata gaining it but even without, its been shown that King can be damaged like with Zoro’s onigiri and Marcos attack. So if he can be damaged when his guard isnt up then whats stopping Kata from doing the same really?
He should be able to outmaneuver King with his FS and strike him down when his guard isnt up.