milehighgirl, it seems to me that the newest tip cuttings have the closest nodes. As the shoot grows, the nodes stretch farther apart. The end of a long branch might have some girth, but it's nodes will be close. As you travel down that branch, you will notices nodes farther and farther apart. New shoots will have closely spaced nodes until they also grow long. If they are clipped from the tree, their girth might be a quarter of an inch, but they still can have 5 nodes packed into their tiny length.
If you were going to take cuttings from an unwanted branch, he tip cutting would have the most nodes. The next cutting would need to be longer to have 3 or 4 nodes, and so on down the branch.
Hope that helps!
Suzi