Dead or Composed. There was only one other Warrior-Servant on the Lesser Ark, an aide to the IsoDidact, and while she [i]could[/i] have made it to a Shield World it's more than likely that she died in the years between Cryptum-Silentium. If she remained alive, she'd have been recalled to the Greater Ark to make the final stand with Faber and the remaining Forerunner military who weren't with Offensive Bias, or she'd have gone to Requiem to submit herself for Composition.