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But we're comparing Ace's durability with Hancock's, which, IMO, isn't her forte. King has a specific ability that makes him (nigh) invulnerable, it's a whole other thing.
We don't know much about Hancock to say what is her forte unless definitely her DF but we know that Amazon Lily is where we first saw haki application being explained. So we know haki is also her forte. Unlike hakiless Ace.