This separation of layers nonsense is only something that’s been proposed to cover up flaws in the core protocol. The original paper didn’t envision a store of value, but rather a means of daily transactions
Many have speculated he may be a time traveler, although they don't give any reason. The only thing I can think of is he possibly traveled back in time after witnessing a massive economic downturn that had people eating rats off the street and an even further (much more serious) dichotomy of rich and poor. Bitcoin could level the playing field stopping banks from having nearly full monopoly of your money.