Ok, just change the ships background to reflect it is carrying 5 Troops worth of Soliders of Darkness. Issue solved, with out having to tweak the ship.
Regarding Shadows in combat, I think they would if need be, as they can move about without being seen by all the races bar the Vorlons and other Ancients. This would make them perfect for assaulting an enemy up close and personal, plus they do have a physical build like that of a giant Praying Mantis so would be quite brutal.
Anyway it is some what off topic, let's try to keep this thread on topic.