This is all my opinion. I'd like to clarify.
In my honest opinion having a secondary clan is pointless in the first place. No clan is special enough to even have a child clan dedicated to bringing in new members.
Having a child clan is more work for the creators and would surely get tiring, since there's things like Discord where people can join together and talk about whatever they wish.
That would feel like a better alternative to having a child clan in the first place.