Ah the first sentence of my message seems to have vanished. I said 'Izanami even though they don't have an Alumni are still a strong house and it would be fun to play as them. Because Izanami with their abilities...."
Sorry.
Also there are no real walls for the Assassins to climb over.
The Rhea Quad looks like this.
https://www.museumsinsel-berlin.de/fileadmin/user_upload/freiflaechen/kolonnadenhof/fr_kh_teaser.jpg