Your suggestion is a good one; but I still believe there could be the "back up" Email - of which I mentioned above.
Are Woltlab Designers reading this ???
It's a good suggestion, I agree.
I will create the super user group as sonnespeer has suggested, but for new admin's setting up a group, that will be the last thing on their mind, especially without a manual to guide them...
There needs to be a backup option, like your suggestion.