How do you know there was a vice-admiral on the ship?That's why I asked Op if that counts for anything...
Ace set fire to a ship that had a vice-admiral in it
Even if Tashigi is only a captain she can use Haki, and point being is that if Ace cannot match a VA than he might as well be under her level.
You should try and put 2 an 2 together to get what is being implied here before reply this post.
Luffy Surpass Ace, he has no haki feats excepted for a flashing back kings disposition
Ace most likely did have haki. He survived the NW several years to the point he even became one of the strongest man commanders. Haki seems to be common even by fodders. Impossible that Ace didn't have it