All of these theories are mental constructs, and are therefore false.
The truth is just what is now, each moment.
If the mind is still, then what am I ?
I don't know, I just am.
Then the mind asks "but am I the only I, or are there many I's ?"
The problem with this is that the human mind is trying to understand something that is a mystery.
The human mind is the wrong tool for the job.
So the only solution is to be, and practice stilling the mind.
Then the mystery might be able to unfold, or I might descend deeper into the mystery that might go infinitely deep.
Perhaps I am a mystery.
Perhaps true understanding is beyond the human mind and human thought.
But don't try to think about what was just said....
See, you're at it again already.....
If something is real, and you are meant to know it, then you will in good time, and you won't need to imagine it or think about it because you will know it.
But the human mind hates this, and will fight back.
It wants to be "in on the action"
"This is so dissatisfying, I want to know !!"
But it can't be in on the action because any real or true knowledge is beyond the human mind.
So be still, and there is the possibility of silent knowledge arising.
Which is the state of being.