Since the other managed to become his housekeeper, it meant that Leland did a thorough background check on the other. Just passing Leland's standard showed that the other not only didn't have any criminal record, he also had a good personality. That already checked the first requirement Wulfric was looking for. After all, the president of Aster's fan club shouldn't have a shitty personality.
The next one was making sure that the other was a genuine fan of Aster. That one was easy to check. After looking at Samuel's [Cyberspace] account, he found out that other only started being a fan of Aster after the Silver Moon Awards. All his posts after that were all about Aster.