It was bullshit from the start, he was already going insane.
You know what, the " i can see myself in every human" is lame. I expected more its disappointing.
There is a crazy homeless man that shout things in a foreign langague outside where i live. I always wondered if those people are seing or earing "thing".
My guess, is just that their brain must have been "damaged" and their perception altered. They have no powers and what they say is non sense.
Thats why this manga did not make me feel anything.
And the homoncili he see are just his social intelligence and perception.