User blog comment:TheDarkKnightHasRisen/Connor: The child, the apprentice, the Assassin/@comment-3168501-20121006222145/@comment-5088097-20121007001249

Some preteens have a deep voice... Maybe Connor started puberty when he was 10 or something. I was thinking it'd be something similar to what the user above you stated but it could be a mix between your theories and the user's above. At this point, I'm expecting the unexpected.