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Translations: Bleach 600 (2)
Acnologia is the King of All Dragons, and doesn't lead a single one. Instead, slaughters them.
He was talking to himself. No human in this world came to the conclusion that he was talking to someone or ordering other Dragons.
Igneel is the King of Fire Dragons.
I'm pretty sure he is the strongest dragon to exist if you don't count in Acnologia as that one is a human that became a dragon.
Maybe each dragon has divided up into a category based on elements, in which they have their strongest member. Igneel is the strongest fire dragon, Gajeel and Wendys might be the strongest in their element and so on. I hope Laxus meets a lightning dragon so he can learn from the original himself.
Acknologia bathing in the blood of hundreds of dragons probably gained power beyond even them, which makes sense.