At age 22, FLW was specially trained, working at the equivalent of a frontier AI lab (the most important architect in Chicago) and in the most booming city at the time (Chicago, especially where construction was concerned- due to the Great Fire rebound)
He's not a random, there are a lot of factors working for him
> equivalent of a frontier AI lab
Except frontier AI labs basically consider the entirety of human creation, multiplied by 100, to be their total addressable market.
The most important architect in Chicago could only ever be able to capture a small fraction of a single city's architecture business.