Bar and hold working in his orginal Killer bull crap the first piece chapter 124 could actually be quite pleasing as far as it comes to a foreshadow. Not saying its enough to form a hypothisis nor a theory, but a nice catch and a reasonable prediction non the less. Caliburn give the guy credit. Even if he is crazy he is crazy enough to dig for hours to find something that is interensting at least this time.
I need to give him credit for having selective amnesia and seeing things that aren't there?
If I would I have to give this guy points for this theory, he would fail miserably. The one who should be the most skeptical, the most objective and the one who should ask the most questions, should always be the maker himself. That way you can make a real theory as what is left already survived the crossfire. This person however is the exact opposite of that. He has not shred of self-criticism whatsoever. Humans don't like chance and coincidences, they always want to see structure and patterns and as a result they always try finding them even if they aren't there. It's human nature, a fundamental notion someone who makes theories should know. What he did is on the same level as flat-earth and the pyramids-were-build-by-aliens theorists. They atomically blot out everything that isn't convenient for them, use whatever is left in a subjective manner and then fool themselves by saying such a thing can't be a coincidence as confirmation.
With other words his working method is wrong and completely the opposite of how it should be done. He already made up his mind about his theory and then started searching for everything that even remotely could be interpreted as something useful to him and afterwards uses the argument "it can't be a coincidence" as confirmation. That's not how you're supposed to do it and that he has been digging for hours is the exact problem. If you dig long enough, you're bound to start see everything you want to see. If he had taken a few steps back and just thought about this rationally, that alone would have been enough to realize how unlikely all of this was from the get-go.
He is trying to connect three characters with each other that have no sensible connection whatsoever. Killer's name wasn't just made out of laziness, Oda made all of him on the spur of the moment during the Shabondy arc. Vivi is essentially a Celestial Dragon and the heir to an ancient kingdom and Sanji is from an underworld organization. They have absolutely no connection with each other whatsoever nor is there any rational reason to assume they do. He also makes it appear like that Oda planned every single little thing while OP has run nearly twice as long as originally anticipated. This is the overall context. Oda doesn't hide in every little detail a humongous secret that will be revealed a decade later and Oda hasn't planned out every single little thing.
The way he reasons you can prove any ridiculous theory as there is no end on how much you can twist and turn everything that has been drawn, happened and said in the series. There are 40 possibilities, but he picks out the one that suits. Then at the next step there are 70 possibilities and the picks out again the one that suits him. After that once more there are 100 different possibilities, but he choses only the one that suits him and then he goes "this can't be coincidence" and then ignores all the other possibilities completely.
The reality is that anyone with a real sense of reason and criticism would realize immediately that almost everything he says is highly forced, subjective and wishful thinking and the only way why someone would believe this is, is if he has the same one-track mind like the creator.