Spacetime Solution: Multiverse Cacophony

I just realized something about multiverse theory, specifically the one where there are alternate realities based on our decisions (where we choose heads instead of tails on a coin flip, for example). While it is possible to have multiple universes where different decisions were made, our alternate selves would only be present in a minute percentage of them (only the ones where we were born rather than someone else, see my previous thought experiment on high fives leading up to one's conception impacting who is born), and there would be an exponentially smaller number where more than one person was the same, so interacting with another person would be an all but unique experience in the multiverse compared to the number of 'Verses. Further still, it would be an infinitesimal slice where everyone alive was the same as they are here, and where decision trees as we would understand them would be valid. The bulk of the multiverse would be populated by entirely different people, based on the statistical randomness of the reproductive process. What's even harder to fathom is that this truth would not reduce in any way the sheer volume of different universes where we did exist and made different decisions, it would only increase the number of different universes so much more than I could have ever imagined before today. I can't imagine how it would even be calculable.

Addition:
So a different set of decisions by any of your ancestors would lead to a different you, given that the odds of "siblings" having identical dna is 1 in ~70 trillion. So there would be 1/70 trillion other yous in the multiverse, genetically speaking.

However, a different set of ancestor decisions leading up to your time twin's birth would lead to necessarily different experience. Whether born in the same moment/event, or a from a different even by miniscule chance, the experience would be fundamentally different and therefore no decision tree of this other individual would be similar to your own.

Therefore the portion of the multiverse with you in it would be fundamentally different than the portion of it without you.  This portion with you would still contain all possible decisions you ever made, but all decisions prior to your birth would be identical in each case.

There is still the matter of each individual's responses to your decisions. Even if these remained identical, or consistent, they would still vary based on your own actions. Therefore each individual decision you make would result in dramatically different versions of yourself based on the responses of others compounded over time.

When having children, statistically speaking these children would be as unique as your decision set (remember your ancestors' decisions create a unique you in each case, and so the same is true, specifically for you and your reproductive partner, for your children, as all prior generations would need to be fixed points for you to exist as you are).

In this way, each generation locks in the next from a temporal perspective, from Adam. While incalculable variations would exist at each generation based off the decisions of ancestors, once a child is conceived, that partition of the multiverse becomes set, being the partition of (Evan) for example.

In a sense we are unique, and critical to the consistency of this multiverse fabric. There is only one of each of us from this perspective, as even those genetically identical experience far different realities, and even those born in the same moment with parallel external decisions from others would bring a vastly different concept of self to the table.

Additional addition:
The sheer volume of decisions would remain the same as it would in multiverse theory. This is because if all versions of your parents made their array of children, whether this is assumed to be all versions of you or a variety of time siblings, the number of overall decisions remains the same, both in inception of you and by (you).  So essentially this partitioning of realities does not impact the overall size of the multiverse, but the relative density within it. That is to say your decisions act as standing waves in my model, where as a fairly even distribution of actors/decisions existed in what I understood to be the classical model of multiverse theory. This is assuming the classical model took into account that your ancestors' decisions actually changed who you are in the timeline.

The sheer permutation of this fabric is mind-blowing after one generation, unfathomable even, and then it continues to expand for all human history. It makes me consider the perspective of God that much more closely, and how these partitions, and the foreknowledge of individuals, are seen from God's perspective.