User blog comment:Legionwrex/How did Saren reach the Citadel?/@comment-3228423-20130507041453/@comment-2250460-20130507044605

We saw what the implants could do to a dead Saren. He essentially turned into a Geth Hopper-Husk hybrid on steroids. At no point did he fly.

Besides, we have no way of knowing if Saren's implants even worked when he was alive, because at the final fight with him (if you don't convince him to commit suicide) he doesn't use them.