Thos are some excellent points too! I've seen some others suggest that Shanks was actually in East Blue to seek out Ace and potentially give him the Nika fruit instead, maybe that was part of Rogers last wishes/words and thus his most important and secretive request to Shanks?
Also
@AdmiralKoniroryu on the same wavelength here too ofc!:
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Ooooh yeah that does add up! His wording made me feel like it was inspired by the death of Ace too, how his (literal) flame was extinguished far too soon and he never really got to live his life to the full and even become Pirate King potentially.
As far as we know, the last remnant of Roger's bloodline has been wiped out and his only child too, with his and especially Rouge's sacrifices now going somewhat in vain too.
If only he knew that Kaido "killed" Luffy too, not long before! The same Kaido that Shanks drove off from going to Marineford somehow, without getting a scratch on himself somehow and thus driving away a fellow Yonko and unstoppable, destructive monster like Kaido, so "easily"?! We still dont know how he did that too!
That makes a lot of sense anyway, Shanks finally had a prime chance to vent some of his wrath towards the Marines and Green Bull who sucks up to the killer of Ace, as well as glorifies the WG and Celestial Dragons makes the perfect target fo Shanks to flex his pent up hatred towards.
Given Shanks seems to be from a Celestial Dragon family himself or some kind of important family in the OP world at least (going by what the Gorosei said in Film Red), this makes his previous actions and characterisation all the more interesting and thus his actions vs Green Bull too and also why Sengoku and the Gorosei were so diplomatic with him too.
Oda also made Shanks look so INTENSE and menacing here too! His speech and thus the words, the lightning storm-like CoC blast that POWERED across Wano itself and we've not seen anyone else do like this yet, his expression, that strident pose etc, Oda really wanted us to see what a truly angry Shanks was like finally! :
We've been told via some Vivre Cards/Databooks/SBS/OP Magazines or w/e in the past, that Shanks has a truly fearsome, unstoppable wrath. That his anger is pretty much unstoppable, ferocious like a beast or something? Might be an editor's comment too? Oda definitely set up a deliberate parallel there with a guy called "Green Bull" who is brash as a bull as expected, went into Wano recklessly against orders and acted on his on whim and such, like a stubborn, cocky bull indeed.
