maybe it is known by the majority here, but I didn't saw this anywhere : depending on the method to repair EDE, he has a different amount of hit points : on my first game I repaired it with 55 science and 35 repair, he has 360( yes !) hp. I send him to the followers in his personal quest, and they don't improve his hit points. on my last game, I repaired him with items, a much easier way, and he only has 180 hit points. I think this is the reason he is regarded by many as a "weak" companion : the majority of players didn't invest enough points in science and repair...updated the wiki