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I feel like this is Oda poking fun at the parts of the fandom ragging on poor Jinbei for not guaranteeing an instant win for the Strawhats now that he's on their crew. Especially since Jinbei himself is pointing out how even a strong fighter is going to be hard-pressed fighting someone who can regenerate their entire head.
Cut the man some slack, y'all, he's doing his best!
Also watch it be revealed that Brook recognizes Gunko from her being the groupie for his Soul King tour always in the front row waving neon arrows like glowsticks
While Gunko's not necessarily geeking out over Brook like we would have expected, in a way this is probably the closest a Celestial Dragon does get to being starstruck. If 'starstruck' means immediately wanting to kidnap the artist in question so that they cater to you and you alone.
We also saw Charlos attempt to do the same thing in Film Red. He liked Uta's music so much that he tried kidnapping her mid-concert to be his personal musician.
And what ended up happening there was Uta not only flat-out told him no because her music belongs to the world, but also put him on blast for being a scumbag before putting him in his place with her Sing Sing powers.
And that's what Brook does here too, with the added bonus that he's sticking by his captain, even to the point where he's willing to lay down his second life. Which is a huge deal for Brook since his dream is contingent upon him getting to reunite with Laboon.
While Gunko is the one who's giving a physical beatdown to Brook, look how she's clenching her chest as if her heart was breaking. And she then proceeds to stomp on Brook some more even after Sommers told her to leave the Strawhats alone.
You could write this off as her throwing a tantrum because she's not getting her way, like Celestial Dragons are wont to do when they're not given instant gratification, but I think there's more to it than just that. It reminds me of how upset Gunko got when Loki vehemently rejected being a God's Knight because they're scum.
Look at what it was Brook said: "I would sooner embrace death than live without honor"
Both Loki and now Brook seem to be confirming Gunko's inner doubts about being a God's Knight. She's getting continual proof that she's backing the wrong horse and the universe keeps sending her those signs no matter how fiercely she denies it.
The Strawhats themselves remark on how odd it is that a Celestial Dragon is a fan of Brook's music. Like those two things are incompatible.
And they kind of are because Brook's music, especially New World, is all about the wonders and adventures of piracy, breaking the status quo, and pursuing freedom as the sun shines down. Everything the Celestial Dragons are against.
And yet, what is Gunko's favorite song?
But what is it that Gunko is most afraid of?
Something doesn't add up.