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Who or what do you think is Acnologia exactly? What power does e had before turning into a dragon? What is his connection to Zere and thereforeto IGneel and maybe even Natsu? Maybe Zeref knows Natsu, because he is just a part (the ''good half'' of Acnologia himself and Zeref separated the two as Acnologia became to powerful and evolved into a Dragon if not his human form? What was his respective Slayer Element, when he was human?
My theory with his Element is, that he maybe was once the Water Dragon Slayer, since it was stated that originally Wendy should take this part, but the idea wasn't build in but thought of, so this is still open and as you look closely at the end of the fight between Fairy Tail and Acnologia, before he/it ''obliterated'' the whole island, he sucked up a huge amount of water to unleash his respective Dragon's Roar-Technique.
If it was a "water dragonroar" my guess would be since he bathed in all that dragon blood (or drank it, to lazy to look it up)
he gained all the elements from the slain dragons.
about his slayer element.. dunoo atm.
maybe he didn't even had an element?
maybe he was a transformation mage(ala elfman, lisanna, etc.) and all the blood transformed him into a dragon and at one point ce couldn't change back to his normal human body.
Acnologia is Natsu, and a final boss. Zeref helped him become a dragon when his "dragon" powers were taking over, or something like that. Sounds Mashima-ish.
Acnologia is a dragon slayer turned dragon by zeref. big black dragon.