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Lorefag here. Council/IRyS got an update/slight overhaul to their lore that potentially impacts Wagahai.
One running theory with Raprus was that the shackles placed on her were put there by council to prevent her from taking over the universe. This made sense due to their sheer power in-lore at the time. When Sana graduated, it made sense that she would be able to take off one shackle, as one of the five powers that placed the five shackles on her had vanished. This means there's two possibilities. First, the theory that Council placed the shackles on her holds no weight at this point. Second, the shackles are now capable of being removed normally due to the lessening of Council's power.
Thoughts? Opinions?