On one hand, people keep bringing up not meeting Galool Ja's mother as if not meeting the parent who isn't relevant to the story is anything new (even in Dawntrail, we don't see Wuk Lamat's mother, Zoraal Ja's mother, Erenville's father, etc., although at least the last one is justified by Viera culture). On the other hand, to my memory, we don't see a single other Mamool Ja besides the two of them at all in Heritage Found or Solution 9. So I guess it just seems more specific than necessary.