Why would you only want to invite an admin and not a moderator? To me the description is confusing “The invitee becomes a moderator on signup and an admin once the inviter confirms the email” so does that mean if you don’t approve their email they will just be a moderator, maybe I’m reading this wrong but you need an activated email to do stuff?
Why not have something like this I mocked up?
Just to clarify that to me its not clear that they become moderators as its called ‘invite admins’ and the tab says ‘Admin’. All I’m suggesting is to make it easier to invite and admin or a moderator.