I think your list is spot on. I've written nodes where I took a guess at the answer (I marked it so) and the questioner replied with "no, that's wrong". But the thread got front-paged, and the node's rep (it was the second below the root) rose to 25 or so.

On the other hand, I wrote an answer to a different question after there had been some discussion and clarification in the thread, and the questioner replied with "yes, that was correct, thank you." The node was very far from the root, wasn't front-paged, and languished around 2. So I agree that content ranks far below placement.

In my own mind, though, the rep-2 node that got the "thank you" ranks much higher. Replies trump votes every time.

Now, given that this thread's slipped off the front page, and my reply is eight or ten nodes down, I predict it will stay at zero!