Gally was himself in the gathering. The only bit he was being controlled in was the bit where he killed Chuck. He was always annoyed because he didn't like the fact that Thomas had gone into the maze and broken rules and he felt that the punishment Thomas had was not severe enough for the crime he had committed,
Espero que ajude eu tenho mais informações sobre Gally, mas se você quiser que eu edite a pergunta, então me avise