well we know that mr3 is heading towards impel doom with mr0,1,2. So maybe none of the keys will work on Robin's handcuffs as they are all fake. However the strawhats run into the BW people and make mr3 make a new one like they did with that cage. I doubt this will happen but it could be cool if it did.
Probably unlikely but maybe mr 3 could*spoilers*
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Or Spandam just kept a 6th and real key on his person without letting up the fact he had it all along.
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Or Spandam just kept a 6th and real key on his person without letting up the fact he had it all along.
That makes sense because if CP9 had the real key how would Spandam ever unlock Robin?
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Isn't there a chapter discussion thread this could be in?
If you spoiler me, I will eat you with tater tots.