I wouldn't go so far as to say that I worked anything out on my own! I had the information from a lifetime of wide and occasionally peculiar reading. I just put it together in various ways, one of which is the 'two-Jesus' scenario. I make no claim as to its veracity, but suggest it as one of many possible interpretations of available data.
As to my brain, or lack thereof, I'm a retired low-level civilservant with a bachelors' degree and a fly-paper mind. I amuse mysef by reading, playing video game and writing fanfiction. There are lots of folk on Medium who are a lot smarter than I am, which is one of the reasones I signed up, to learn new things.