User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-95.93.30.63-20121117192748/@comment-4212769-20121117193900

Well, when you read my comment more intensely again you should see this: "At this time when it splitted to the way of Blue Yian Kut-Ku and the Yian Garuga your theory may occured..." so I never denied it. It's actually pretty plausible.

I just wanted to say that Yian Kut-Ku cannot be the actual ancestor of Yian Garuga but when it doesn't change for a long time what doesn't seem likely as it isn't too well adapted to its habitats so that it could survive very long without changing at all.

On your nocturnal theory I can only say that's pretty plausible.