Bronson Jack AND Big Red: Their dedicated combat expertise and service in a professional military would prove invaluable in a "holding-the-line" situation like this.
Gordon Roberts: You're on a ship full of mechanical constructs, and he's an engineer. Might come in handy at some point.
Jen Vernon OR Squishy: Getting shot is bad, having a healer around would be nice.
Jack Golem: What better way to learn about the horrors of the universe than to experience them first hand?