Back in Season 3 we hear Canach turn down a place in the guild (Episode 4, the "Confessor's End" instance):
Commander: So...no Dragon's Watch in your future?
Canach: Regretfully...I've been under someone's yoke for too long. It's high time I walk as my own sylvari for a while.
Commander: Well, being in the guild doesn't mean...but, I understand. Thanks for everything, Canach. You've been a good friend.
Canach: Oh, don't start weeping about it. I'm sure our paths will cross again.
However, it seems like he's as likely to be with us as some of our already-official members lately - especially in this episode, where he's in charge of running a tournament, participates in a meta event, is in several story instances, and plays a rather large role at the end.
Did he ever officially join Dragon's Watch, and if so, did it have any real implications for him?