Bodhi Rook: the one that made it out
Was Bodhi really the only one that Galen ever tried to use to get a message out to the Rebellion? I mean, he had thirteen years of plotting and planning, and surely during that time he figured he had to let someone know about the flaw in the Death Star. There’s no point in having a flaw in a superweapon you don’t want used unless someone other than you - someone in a position to do something - knows of it.
So maybe Bodhi wasn’t the first Empire employee Galen tried to use. Maybe there were others whom Galen didn’t trust as much to tell the whole deal (just hinting to start with), or who broke down under the pressure before he could send them out, or got shot down while they were getting out without giving away his secrets. Maybe Bodhi was just the one lucky and skilled enough, who believed what Galen told him (the whole story this time, because at this stage, Galen is useless to the project but the flaw has already been completed) and gathered his courage together, who saw his chance and took it, and who made it out and got away.