No Duplicates and Switching Playbooks

In Soviet Apocalypse World, question has a you!

When you switch to a new playbook, you keep the old one for reference, but does it become available for another player to use? Character creation rules say no duplicates, but you've switched, right, not added...?

For example, I am playing the Battlebabe, and Andrew is playing the Maestro D'. Last session we both got our fifth advance. If we get our sixth advances next session, and I decide to become a Hocus, say, and he decides to retire his Maestro to safety, can he introduce a new character who is a Battlebabe, since my character is now a Hocus? And if my now-Hocus character gets killed two sessions later, I can introduce a new Maestro D' right?

Or do either of these situations break the no duplicates rule?

Was the fact that you blocked other Battlebabe PCs from coming into play part of your character's intrinsic self, or just part of their old life?

And if I decide it's the second? I still keep the playbook.

Sure, you keep the playbook, but if you decide it's the second, someone else can play a battlebabe if they just print out another, or even just look at yours for a second to remind themselves what their options are and write it down on a piece of paper, or something.

just print out another

Whoa there now, let's not undermine the fundamental scarcity at the very heart of Apocalypse World -- the scarcity of playbooks is the basis for all my best Fronts.

Now I want to play a game set in the middle of a ruined business district, all broken skyscrapers and rotting public works, with a Grotesque Front called The Paperwork Vortex.

The library of congress as a hardhold.  Or even just the central library here in Chicago.  Or a long-term paper storage facility for companies.  Anywhere that words go to die.

… a long-term paper storage facility for companies.  Anywhere that words go to die.

Oh yeah. This. Tunnels and flickering lights and paper demons and the evil secrets they keep.

In Soviet apocalypse world, paperwork keep YOU!