I think it's great that you take the high road and don't resort to dragging other people through the mud. You definitely seem to place the responsibility all on yourself, which I imagine is not always the full truth. Not providing any reason at all, actually makes it sound as if the two co-founders just randomly and completely bailed on you. (Which may be exactly the truth)

I was trying to imagine a logical scenario, for example they had an even better opportunity. Or perhaps it was better to split before the stakes became to high. Maybe the salaries were not going to be what was expected, there were disagreements on responsibilities, etc. I can imagine a lot of scenarios.

Not to diminish your article, which I found extremely interesting. It was just a point that definitely seems like there was a greater story to be told.