SPOILER SPOILER SPOILER
Spoiler:
i took x6-88 as a companion for the first time right before I teleported to the final battle against the brotherhood in the 2nd to last mission of the main campain. He did not show up when I arrived and did not appear with me again after I completed the mission. please help ( i should not that he was not in the teleporter room when i teleported to the airport so that could be part of it.)