It's not about predicting what Oda does next, it is the fact that what he writes is completely random. His plotlines serve no purpose, just random shit he thinks of on the spot. This whole Lucci vs Luffy is an example of a random plotline. Absolutely no reason to waste our time on this predictable outcome. And yes most people can do what Oda does. It isn't hard at all. You can do it too, think of any random plot line right now, and that is exactly how Oda writes.