User blog comment:Legionwrex/How did Saren reach the Citadel?/@comment-62.87.146.93-20130507165758

I think he was transported by a geth colosus or geth armature with his geth subordinates. We all saw so many colosi and armature. There were no enemies for him unlike for Shepard, so unlike the commander he wasn't slowed down by his foes.