Where and when in the manga was showed Ace using or having armament haki?
Armament haki wasn't introduced yet in Arabasta so back then Logia vs. Logia would've almost always resulted in a draw. Ace was probably capable of using it though and he's the better fighter too I think. I'd give this one to Ace!
I agree with your first sentence. But Ace never used haki, not even in the war where haki had already been introduced. So how was he capable of using it?
He was the second commander of the Whitebeard pirates. It would be ridiculous if he wasn't capable of using Haki. So what if he didn't use it in the war? A lot of people didn't.
We don't know if he used it in the war. Back then haki didn't turn your arm black. We saw him use Kings haki so he definbetely knew about haki in general. And he was second commander of probably THE strongest crew in the world. It's hard for me to believe that he wasn't capable of using CoA.
We did see Ace blocking Smoker's Logia form back then. That's something.
Crocodile said he trained himself to change to his Logia form as a reflex from being attacked. I don't think how that would be possible without CoO. Or maybe Oda was just being creative.
Not necessarily. For example, Aokiji changed the shape of his body to dodge Whitebeard's bisento. That would not work against the Yami Yami no Mi. And from Blackbeard's explanation of his own fruit, the user should be unable to use any Devil Fruit power as long as he is touching them, rather than just hitting them.
He didn't block it using Haki though, it was his fruit's ability that blocked Smoker's smoke.
I believe that was just Oda demonstrating the degree one could master his fruit if he was determined enough. Crocodile was the most skilled DF user we've seen in the series up to that point and had complete mastery of his fruit's ability. Eneru was the first person we've seen that used CoO in conjunction with his fruit.
I thought it functioned like Haki? He managed hit Ace in the neck without completely holding him or touching him. Unless it was a by product of him using Kurozu before hand?
BB Devil is OP . It was impossible for Ace to get close to him without his Devil Fruit ability being taken .
It's like Eefrit said, assume all you want, but the only haki Ace had was Conquerer's Haki (inhereted haki). He never developed or was shown using any of the other types of Haki.
Your argument would be valid if Ace tried to stop Akainu. If he had become intangible, Akainu would have passed through him and directly hit Luffy who would be dead. Ace tried to save Luffy at all costs so by taking in his fist he protected Luffy. Besides if Ace wasn't shown to use CoA, then the same could be said about all those who were at Marineford, some were hinted to use it, but alas we don't have any definite proof of them having it. I really don't see how Ace couldn't have known about CoA since he's in the new world and most big shots know about haki, in fact it has become rather common ever since we reached the new world.So it would make sense that he had a least one or two types, and he's not supposed to master it, just know how to use it.Again the concept of Haki while he appeared very early in the manga, wasn't developed to much later, imagine what it would be like if Luffy had learned how to use it before going to Marineford, Ace wouldn't have had to sacrifice himself to save his little brother.
As much as I would like to believe that, as I mentioned earlier, we have folks like Crocodile and Moriah, both New World Veterans, who were around yet never demonstrated it as they were "in too deep" and already had established fights. I guess we could make an excuse for Moriah and his having a broken will or what not, but the other two wouldn't be that simple I don't think. I personally think that these three weren't given Haki at the time because Oda wanted to avoid an inconsistency in the story. I'm sure he would get asked "Why didn't soandso use Haki and at the time if he knew it?" quite often.
I couldn't care less for Moria, what a waste of character, but Crocodile.... it actually always bugged me how he appears not to have Haki, if you think about it it would have allowed him to be more efficient with his DF. Nevertheless I think being part of one of the Yonko's crew makes you stronger than some shichibukai. Again this might have been done purposely by Oda so it doesn't matter that much.