If you look at the story it is no wonder that Oda is improvising here and there: We have a whole exciting world build right in front of our noses with very detailled connections that overspan arcs and are taking years to get revealed. So, in my opinion it could be difficult at times to think of every aspect.
I think Oda one of these string boards in his office to not lose track of every aspect of his story:
I think Oda one of these string boards in his office to not lose track of every aspect of his story: