No... He new to much about there home world, about there technology, how to get on the ship and so on...
He was just one of the last few intelligent ''Prawns''' to survive...
There had to be some of them Intelligent enough to create the weapon's that they had... its just the few that survived lacked such ''brain power''
Im thinking that the majority of 'prawns' that survived and came to earth were what you would call the 'worker bees' this would explain there lack in intelligence, not that they weren't intelligent they just lacked some compared to there higher ups...?
He wasn't the only social or emotional one there... Christopher Johnson had a friend at the start, who got shot. friendship works both-ways... ''Prawns'' also live in colony groups, so one would assume for this they would want and need the contact with others of there species... etc