After Wano, there are no more reasons for Oda to hide Haoshoku Haki from the other top tiers. With Zoro, Yamato, and Luffy being part of the new wave, Shanks has already demonstrated possessing it, as well as Garp, Roger, Whitebeard in Oden's flashback along with Oden himself, and both Kaido and Big Mom. Even Old Rayleigh, when he appeared after Wano, showcased advanced Haoshoku Haki. However, three admirals engaged in conflict after Wano, and none of them even displayed CoC. Aokiji, Green Bull, and Fujitora, with Kizaru about to prove that he also doesn't possess this legendary Haki.
@comrade