And Mouch dying would free up a spot on Truck for Rome Flynn's Jake Gibson to join just as Gallo dying would.

Source: https://www.cinemablend.com/television/chicago-fire-adds-new-firefighter-rome-flynn-season-12-nervous-about-gallo

Mouch had included him in the group chat because he thought it would be unfair to exclude him.

Source: https://www.celebdirtylaundry.com/2023/chicago-fire-recap-05-17-23-season-11-episode-21-change-of-plans/

One man destined to not appear in Season 12 following the shocking ending to Season 11 is ) as Randall "Mouch" McHolland.

Source: https://collider.com/chicago-fire-season-12-cast-release/