If that would happen, Arrow should expect a very sad Roy and a somber storyline to follow him and Oliver working towards protecting Star City while mourning her death.
If Roy is coming back, where is Thea Queen?
In confirming that Roy Harper would join the show as a series regular once again in Season 7, the EPs failed to acknowledge the elephant in the room.
Roy’s return from the mission, and willingness to hang out in Star City full-time, definitely throws that happy ending into question, and leads us to speculate that Thea may be killed during the mission to destroy the Lazarus Pits.