Once again you bend the rules to suit your purpose. Let's just stick to the basics.
"Shelving": The act of shelving is defined as bringing back an already dead/retired character. Once a character is retired it may not be ressurected again, it is for all intents and purposes gone.
Returning: The conditions for returning from time away for death or retirements are as follows. One must choose a new name, new Caste, and new Home. They may not Lead a home, return to their old Home, Station, Free Companion, slaves, nor train for the Caste they had in the previous Character life for at least a period of three months(earth time).
