I did a little cherry picking in images, but mainly just to find ones not overly edited.
I wonder which is thought to be the oldest. Middle to east Asia is where the Eurasian Eagle Owl and the Fish Owls were the least GHO looking, while the more away from East Asia we go in either direction looks more GHO. If they branched off to be the Fish Owls that are only in Asia and the Snowies in the Arctic, that would seem to be where the most diversity came from.
I’m no zoologist though, so don’t put much weight into this. 🙃