Yup, that would explain it. It's ok though - I like Murdoch! It should come with it's own special station: Human Fleet Command Station - the badly damaged hq of one of the factions from the human civil war. Its impressive defenses are on par with that a Superfortress (albiet more from local fleet buffs than direct damage, which is still pretty impressive), and the AI is extremely wary of letting it fall back into human hands, as it is both a potent weapon and a major rallying point for humanity!