ok, I suspected that.
THEN, and take this as a feature request to improve the plugin, is there any good possibility that in a future version of this plugin you autodetect the next available Site ID in order to use?
Because if I have 7 sites, and I delete those with ID 5, 6 and 7, and after 6 months I have to map a new one, it will be gladly welcome that this plugin automatically detect or at least suggest to use ID=8.
Maybe, also, the WP team should also work this out in the network/site-new.php, to show in a big, bold, capital letter, the ID of every newly created site, so that, admins can do their job a bit more pleasant and quickly :)
I bet it's not as difficult to do and you can make it in a visible space of the UI ;)
Hope it to be widely accepted and implemented. Thanks.