What if Jiren accompanies Future Trunks to the future in Arc Zamasu?

[SIAD]

What if Jiren accompanies Future Trunks to the future in Arc Zamasu?

Suppose Jiren just happens to show up on Planet Earth and offers to go to Future Trunks' Timeline.

How would the story unfold?

 

[GreatSaiyaman123]

He blinks Goku Black to death and seals Future Zamasu.

ToP might still happen if Goku asks Zeno, but he may not erase the losing universes.