Not really, the return is just a plot point in itself, it doesn't bare any controversy, in fact its pretty cute at close quite well the arc of the sisters act.
What bares a controversy is the choice of the return, this needs to be analysed in detail. I'll do that.
Well gotta say I am curious about what you have to say about this so Ill wait till the thread.
There is an high chance that only the Kozuki and their relatives knows about the sword. We are in a country of extrem poverty and disinformation, the reality (shape and colors) of the sword is something that is most likely unknown
Plus there is no better hidding than in plain sight.
Nah the theft of Ryuma's corpse and the national treasure was states to have brought the entire country to it's knees. Zoro was caught cause someone spotted the sword and framed him as the vile thief.
I don't see how this can be seen as a plot hole. A mistake from Kaido certainly but characters are human, they make a lot of mistakes. For example Kaido could've used his awakening far earlier but only used it at the last moment.
It became a huge contrivance. Kawamatsu is a walking counter to any reason for Kaido thinking his method would work. Once again, we have absolutely 0 evidence of this ever working. Just a contrived plot device for getting Luffy into Udon.
Sanji is a man full of contradiction. This is one of the reason why he is so interesting. But we need to be careful when we hear "nice". Sanji's nice side, is not to be compared with someone that is nice all around with everyone and everything. Sanji's niceness has more to do with caring. Caring about people in difficulty (hunger) and caring about his families.
Sanji was still called the kindest SH. Luffy, Nami, Chopper and Franky displayed far more kindness than him. Even Robin's sacrifice was more kind.
You can say Sanji is misunderstood or that his mistakes ate exaggerated, but the best written? No way.
Indeed, a lot character in One Piece are two dimensional, but we will see that once Oda create a real character, they become more than that.
Who counts as a real character to you? From the top of my head Robin, Franky and Whitebeard comes to mind.
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Kin'emon was asking for Zoro's help and his crew. He couldn't ever think on something like that. That's why Hiyori sucks as a character.
And I'm pretty sure Tobiroppo except X-Drake were all captains (maybe vice captain in Page One case) that had their will broke by Kaido.
Should elaborate that I'm talking about conquerors. Kaido of all people should know how stubborn COC users are from Oden, to Xebec, to WB, to Shanks, to his own daughter who resisted him for 20 years. Add in the fact that a non conqueror like Kawamatsu easily resisted for 13 years then you see the whole problem.
You talk about him not hitting women or destroying Raid Suit?
He choose to feed Krieg despite knowing his nature due to warnings from his fellow chefs. Sanji ignoring them would've caused the Baratie to be taken. In Enies Lobby, Sanji refusing to sacrifice his code would've led to Robin being a prisoner and everyone dying, but luckily that bathwater fell on him.