Just to clarify: Original Participation is misnamed, because it is not participation.
We cannot participate in that which is unconscious and passive - in OP we are immersed-in-reality, we go-along-with-reality... indeed we are swept-along by it...
But we cannot our-selves take a participating role in reality until after we have become consciously aware of reality; and then (from our-selves) actively chosen to join-in-with the ongoing work of creation.
So, Final Participation is, in fact, the only true participation.