[@Hank] I just thought up something that could be a good reason why Mirage was distracted for the length of the mission.

Say there was a pair of scammers wondering the Omega docks playing at being inspectors. They want to make a quick buck on nervous or naive crew members left behind on docked ships. Knowing Mirage he'd be well aware of these type of skulkers and despite being left to his own devices has to deal with these assholes. Something to a narrative of being a distraction enough to pull him away from the current mission to deal with them trying to board the ship to inspect or intimidate him. Anything along those lines depending what you have in mind.