Why I brought Impel Down because of the following reasons:
1)CP0 wants to make sure he's dead
-I remember in ID there was a lvl where prisoners history was removed from existence.
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This could have explained why he picked the name Who's who.
2)Prisoner
- Who's who said I can't believe you knew the story (A rogue member of CP9 breaking out of Prison) - Ch1017
Impel Down was the best prison WG had. It was stated multiple times in ID arc that's it's best.
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And the prison break happened in ID 2yrs back.
3)Talks about the Legend
-Back when I was in prison I was told to pray to someone for salvation- Ch1018
In ID Mr2 also talked abt Miracle person
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4)Torture
Who's who said, "I used to have it rough"- Ch1017
"My cruel sentence was dragging forever. I just wanted to be saved" - Ch1018
-Again ID we saw guards luv torturing ppl.
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5)Ppl getting Vanished
Who's who said "Guard who told me vanished"- Ch 1018
Interestingly ppl did vanished in ID too
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It's interesting that whatever he told in this chapter n previous ones gives me strong ID vibes.
I understand that chances are very high that he might have been imprisoned in some other prison prolly with Fish man slaves (which could possibly explain he knew so much abt Fish men history). The only problem for me is if Nika was a legend in Slaves book then we should have got something about it in Boa's or Koala's flashback.
But I have to say Oda did bring back those ID memories in this chapter.