After soaking in the Lazarus Pool, Jason saw some fragments of the future in his madness. He realized that he was not an irreplaceable Robin to Batman, and he was just a dispensable child to the Wayne family, and there was no even better child.
So after leaving the League of Assassins, he did not return to Gotham, but chose to come to New York to learn how to live as a normal person.
At the same time, others also saw fragments of their future. [Note: The relevant clips in the future are all related to Jason, but they are in a parallel universe, and there are various possibilities]
So...
Batman from a world where Jason died again to save him
Nightwing from a world where Jason has had enough of misunderstandings and never looks back.
The Joker from the world of Jason as a Lover (TBD)
The Child from the Dead Is Harley Quinn from Jason's World
…
Tony from a world where Jason is his biological brother who died young
From Jason and Bucky are childhood sweethearts world captain
From…
To be set...
Things to know when reading the article:
1. I have no brains to brag about Brother Tong, and all the plots develop for the sake of bragging about Brother Tong, so don't have too high expectations in terms of writing.
2. Cp is not clear
3. Generate electricity for love, but the pit is uncertain.
