imus devil fruit is beyond awakening
i believe that there is a step beyond awakening, and we have seen imu use it.
awakening is defined as when the souls of the devil and the user become close and resonate in a way that allows the user to extract all the potencial abilities and moves out of that fruit. for a zoan that would be to take for himself the atitudes and fighting style of the animal you can turn into.
but awakening is only refering to the powers and abilities granted by the fruit.
vegapunk talks as if the fruits are created by human desires and discards the idea of there beeing a devil inside the fruit, but if in fact there is a entity with a soul inside the fruit that would mean that its possible to use the soul energy of that devil to produce haki.
the next evolution for luffy would be to be able to use a 4th type of haki that cant be learned by humans that dont have devil fruits and because of how rare awakening is, probably no one has even though about using it because they dont have any reference to learn from.
this comes from the fact that "omen" is a miss translation and the japanese word for it "maki" uses one of the same kanji as in "haki" but changes. basically changing soul power to devil power