@MasterKingJC:
If you think Oda is unpredictable in the grand scheme of things, you haven't been paying close attention to the details and hints he's sprinkled througout the story.
If you think he's not, I laugh at you man. Back in 2008 everyone thought were headed to Fish Man Island. Don't even get me started on how Kuma separating everyone blew people away. I'm sure you saw all this coming though.
@ARC-1300:
Not only that, most of the arcs play a similar formula every arc. And had been, for quite some time
To be fair, just about every arc does have similar elements to them. Oda starts off by introducing the key concepts, people, events, islands culture, villains, ecetra. Has Luffy at some point lose to said villain. Has Luffy face the villain again, this time usually wining. Everyone has a party, and moves on to the next island.
The only major arc to never follow this formula was The War and all the smaller arcs leading into it.