(An unrelated post about something I'd just thought of:)

The "problem" of the Trinity never really bothered me that much, to be honest.
A person could be said to be "split" in a way, whenever there is a change in attitude, personality or whatever the person happens to remember at the given moment.
Then there are actual multiple personality disorders, as well as lots of SF thought experiments about "hive minds" etc..

Simply never bothered me as that Great Mystery or Great Absurdity, as it does some.
But whatever.