User blog comment:Sky-Dragoon-Twilight/Hints toward Zeira being alive/@comment-25334245-20141223000031/@comment-9595671-20141223030218

Well just because your in a guild doesn't mean your a member, Romeo wanted to be a Fairy Tail member but couldn't until the timeskip which means there's a minimum age requirement.

Plus I don't see the marking of Red Lizard on either of them, so neither of them would have had the guild mark even if they were associated to it.