Take your own advice. It wasn't my only prediction, it was one.
Claiming to use it is not the same as actually doing it. Obito had the other Rinnegan hidden somewhere nearby, he may have been referring to using them both.
It's not an assumption, it's a hypothesis. The outer and inner paths are their own things, not one of the six paths.
Now who is assuming? Oh wait, your whole topic is an assumption.
What's this "we" bullshit? You are one person, not many. Do not put yourself on a pedestal and generalize your thinking over everyone else's. It's very narrow. And if it is such bad writing, perhaps you should go write and illustrate your own manga, Mr. renowned author and professor of literature, though you have yet to use any literary principles or objectivity as a whole to justify yourself. Here's some: Suspense, foreshadowing, dynamic and critical thinking.