Why didn't Sylas become part of the Illuminators?

He didn't want to cause harm to Demacia at first. He gave himself in order to protect his family. He should have been contacted by the Illuminators when he admitted having magic powers. Why wasn't it the case? Was it because he was already enrolled by the Mageseekers before he had the chance to meet the Illuminators? Because he was already a known wielder of magic in Demacia and could compromise the secrecy of the Illuminators?
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