User blog comment:Master Sima Yi/Assassinews 03-03-'13 — Assassin's Creed IV: Black Flag trailer and screenshots/@comment-4928711-20130310170340/@comment-3046679-20130310184647

The fact he got initated when he got the robes means just that - initiation. He's become a novice. Because you seem to forget what Achilles said when they met - "Don't think you can just come in here, throw those on and call yourself an Assassin."

So no, Connor is not a Master Assassin in any sense of the word.