I think there should be something called owner badge in telegram for person who created telegram group, this is different from admins.
Only owner can delete it.
There is, but I think it's only visible to other admins/mods. Not sure about it tho, but if any GOSU could go into the group chat and scroll the member list until you see what it shows for efi... (I can see him as admin on the chat, but owner on the member list)