@Robby:
Really? So you forsaw Garp being Luffy's grandfather? Dragon being his father? Thriller Bark? Sabondy? The crew seperation? Implel Down and Aces death? The timeskip? Sabo? Punk Hazard? That Raizou would be a ninja? That Zou would be a giant elephant?
You forsaw the crew going to all those places, all the people they met and things they achieved?
Wow, I don't remember you so accurately predicting the series and all its details in the past!
The overall grand scheme of the series might be laid bare at this point and readily analyzable, where its posible to reliably predict the broad strokes of things, but Oda hasn't been super straightforward and predictable, he's had plenty of turns and surprises, especially in the little details and character bits.
Wow, most of what you wrote is completely off the point. First off, I half saw Garp being Luffy's grandfather. I never saw Dragon as Luffy's father. When it comes to predicating, sometimes I lay my thoughts here or I keep it to myself. Most of my predications before the tome skip is wrong, in fact starting in chapter 490 when the story arrived at the Red Line; I decided to stop making wild guesses
Now, you may wonder what I got right? It's not like I was all "It's going to happen!", instead it's me reading the story silently without making wild guesses, and starting at the New World; the story got more obvious that you could see it miles away however that does not mean I'm always accurate, I even though the Zou arc was going to be a "Lost and Found" arc where Luffy must search for his missing crews.
Here is some what I got right so far:
Ninjas: Before Zou, I always wondered if we are going to see ninjas in Wano Country. And then we are told that there are ninjas in this story.
Impel Down: When we saw Crocodile and Daz Bones; it was obvious that they were going to escape with Luffy
Zou: I saw people thinking it's going to be an animal island and I was starting to think it can be possible. And when we arrived, yep; we are pretty much correct
Dressrosa: Most of Dressrosa was predictable; but I still got some parts wrong. Some what I figured that the toys were Devil Fruit made and the Toy Soilder was Kyros, Corazon a male, Doflamingo faking resignation. However what I did not expect to see was Gear 4.
So no, I was not always accurate, I still make wrong guess and still faced the unexpected, my point here is that Sanji being a royalty or is connected to it is a high possibility.