"I do know two Skywalkers, but no Luke. Shmi, and her son Anakin." Perhaps the young woman's Luke was a relative? Most families were bigger than two people, it would make sense. Though if this Luke was a Jedi... hmm. Definitely odd, as he was prepared to swear that there was no Jedi named Luke Skywalker at all. And yet, hadn't he been told that people could come to this place from different times?