@People:
However, the fact to hear people like Coby and Aisa did, is not likely Mantra because both of them can't predict and both of the Mantra users can't hear the voices.
It's basically said in the manga that that ability is mantra as well.
A type of precognition/predicting movements and knowing when ppl in a certain area have died/knowing a person's location even if you're miles away.
Aisa and Coby just seem to have half assed versions or in Aisa's case she hasn't trained her ability to be proficient in all areas.
It's like a rokushiki user that can only use tekkai. You can't say it's not rokushiki just because they're not able to use the other 5/6 techniques yet.
@People:
Yes he has Mantra. Ok, i didnt said the opposite. But he can't hear the voice because of the Mantra/Haki, I think that hearing the voice is not Mantra/Haki.
You're talking about two different things. I'm talking about just knowing when someone dies. Enel just like Aisa was capable of doing that. There's knowing when a person dies even if you can't see them or hear them die with your ears and then there's Enel's specific ability of hearing conversation at a distance. It pretty much seems when it comes to the life and death of ppl far away you're able to hear it in your head in the form of a voice I guess or at least that's how Coby said it.