First and foremost, all kinds of Zoro is top-tier arguments are plainly dumb. Hakai stopping itself is a top-tier feat—as in only top-tiers can't replicate it—but Zoro put everything on the line to stop it while the top-tiers need not suffer nearly as much.
While Hakai feat doesn't prove Zoro's gonna dog walk every single attack weaker than Hakai, it does imply he's better at blocking stuff than all those who stood behind Zoro, giving up their lives, as he blocks Hakai. So if King overpowered Zoro when he's better than physical monsters like Luffy and Kid at defense, it means his AP is extremely overpowered. I guess we'll have to see how well King can block attacks to know how well he can do against Hakai.