Sev1: ProtoS, proto-Severian, Severian the Cruel. Goes to Thrax, War, gains Throne, goes to Yesod, comes back.
Sev2: the putative Narrator, the optimized Severian. Gets Claw; meets Apu; goes to Thrax; meets Typhon; meets Ash; gains Throne; gets on ship bound for Yesod--dies on ship.
Sev3: Avatar of Change, The Conciliator. Goes to Yesod; <trigger point> creates the white fountain (not blood magic this time); returns to Urth as Conciliator; <trigger point> gives Claw to soldiers (then dies on Mount Typhon and goes independent of Severian the Narrator?); goes to the Deluge; dies in Deluge (go to Sev6).
Sev4: the white fountain. Linked to Severian the Narrator. Enters new phase (not so closely bound to Severian) when it merges with the Old Sun to create the New Sun.
Sev5: the Claw of the Conciliator. Independent, but possibly has memories of Sev1's penitence in Yesod--this becomes the guide for miracles.
Sev6: Avatar of Culture. Apu Punchau. Goes as far back in time as he can; teaches civilization; is murdered; becomes independent of Severian the Narrator <trigger point>.
Sev7: the Sleeper God of Ushas.
Still unaccounted for: Severian armiger of the mausoleum in the necropolis at the Citadel of the Autarch. Best candidate for this soldier at the dawn of the Age of the Autarch would be a revived, independent sliver of Sev3, after the Narrative spirit had moved on.
=mantis=