This whole avatar thing seems like utter nonsense/headcanon, even from Micah's responses.
As far as I've seen, there's no actual statement about avatars, nor there being a higher universe where toriyama is writing from. For all we know, in the instances where Toriyama is outside of the story while writing it he's just in another universe. Not actually a higher universe/dimension. (Like
Re:Creators). Beyond the reality>fiction elements there's no actual proof of transcendence.
And there being multiple Toriyama's on screen meaning they're all avatars of a higher dimensional entity.

Throw the rating away.
Edit: If stuff like this was enough the Doki Doki protagonist would be Low 1-C.