Earlier quoted context omitted.
What even is I though?
"I" is something that knows its place in space and time, the here-and-now, but also has a memory of here-and-now moments of the past. As such "I" is an illusion. If a quantum clone of you is created both I's will have the same memory of the past here-and-now moments, so both will be you at the same. So probbaly something similar happens if a brain is split.
In discussions that invoke the words "self" or "consciousness", I find it common to hear pithy or clever definitions. However, rarely do those answers offer any actionable insight.
Are you sure that your words "I" or "consciousness" point at extrinsic things in the world? Have you not just invented a new kind of elan vital? If you claim that "consciousness" is a useful category of phenomena within consensus reality, then great. Demonstrate that.
Dark matter is a mystery, but it is a mystery comprised of concrete phenomena. Terrestrial biogenesis is a mystery, but it too is comprised of concrete phenomena. Heck, even the amorphous term "love" points to a more concrete category of phenomena than the word "consciousness" typically seems to.
FWIW, I think there are concrete approaches to the problem. One method HN might like is to study how we judge subjects as being conscious. Anyone want to build a NN classifier for this?