It's a good question, but we don't know. Any ME: Revelation readers here? Saren was present in that book; did he already use biotics? Land Raider 18:02, November 6, 2011 (UTC)
He had no biotics in the book. He finds the Reaper artifact at the end of the book, then the events of ME1 happen. Also...IIRC I don't think he displayed any biotic abilities in the game either, right?
^ Of course he did. Barrier, for example. Land Raider 19:29, November 6, 2011 (UTC)
^He also used Warp, on Virmire.
Saren used his biotics on Virmire, before Sovereign heavily "upgraded" him. I guess he was a biotic before then, and it would make him a powerful Spectre.