They're discussing something that was revealed about Mavis in the main manga. They're spoiler tagging it so those who haven't caught up with the latest arc/chapter won't get spoiled.
I think Simonsy's theory is plausible. It also explains why it only seemed a very short time before Precht became the next guild master after Mavis, when Mavis is much younger than Precht and thus could have held that position longer.
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