How Do I Know What I Think Until I See What I Say?

So, I quit Nanowrimo last week, after I'd reached 42,000 words. That's crazy, right? I mean, I had eight thousand words to go (have, I guess, since it's not midnight, yet), and I could certainly have made. I still could, in the nine hours I have left. But I'm not going to. It just hit me a few days ago, right before Thanksgiving, that I wasn't going to finish. The thing is, I started Nanowrimo to knock out a draft of the Next Book and I did that. In 42,000 words. HAHAHAHAHA! you may be saying. "Jay, there's no way that you have a viable YA book in 42,000 words." You're right. But I wasn't writing a final draft, I was writing a first draft. And I'm a reviser, not a planner, so that means that what I actually got was 42,000 words of a possible path that the book might take. The actual draft of the book that's fit to show anyone (think two to three drafts from now) will be considerably longer, and will actually make sense.* The