Wow.
The "common secret" of CP9ers, which naturally, everyone knows…
From this point, the story should move on how the absolute command system of the WG-Marines to counter pirate's democratic system would spark destruction everywhere instead.
This explains why it was almost always Lucci's face, not Kaku's expression which close-upped during the Robin-Luffy encounter and Ohara flashbacks. Maybe he had a similar past with Robin as a surviving child from somewhere. He might also start to ponder about his position as WG's assassin/mere pawn compared to Robin's as a protected strawhat crew.
Mirrored on how he praise Luffy's leadership compared to Spandam's.
How the symbolic scars depict the weight of the burden of whatsocalled justice he had to carry on his back.
Maybe Lucci HAS to be cold because he was created that way.
How he articulated the "I have no feeling on Water-7" along the train travel now seems like denial to any possible feeling that come cross his heart.
The five years of spying days might give him time to think and feel by himself, not by following stupid orders anymore.
This also starts new question on the use of devil fruits.
Whether Lucci's bloodlust comes from his Leopard ability, or whether he was originally lust for blood even before he ate any devil fruits, which made the WG decided to spare him one. Whether Kaku and Kalifa would switch ability if they switch their devil fruit or not.
Like one of Russian Tolstoj's short story, how innocent rice-made Vodka could create a beast out of people, not because the liquid contains any beast's blood, but merely the essence contained in human's blood itself that emerge from within. So on the devil fruit, maybe the ability actually comes from the unique hidden personal characteristic of the human instead.
But if that so, then how pathetic the WG build assassins like Lucci&co?
Did they choose a bad naughty potential kid since the beginning, or did they particularly educate them as one?
The story should start to put spotlight on the dark shadow of CP9ers.
I really want to know how each one of them end up becoming CP9.
(especially Kaku, who seems does not fit his character, and also Kalifa, shamefully stupid though diligent as she is).