Equality's plan to free his friends failed.
Unless he learned about drama via osmosis from hanging around under the theater early in the book, his first instinct should have been to continue his journal documenting his rising nation and eventual toppling of the world. The fact that the last chapter was his last entry means he probably died before he could make another one.
Prometheus and Gaea are the founders of the Mephi
The society they fled will eventually evolve into the One State.
As elaborated here
, the dystopia was the result of Galt and his followers withdrawing from society.