Okay so we'll forget about that wipe to Tatooine.
Instead of three, just consider two instances of shrinkage (70632 & 128032).

I've presumed the shrinkage happened at the telecine stage.
Imagine the telecine operator finishing a reel at 5:00PM then going home.
Next morning he starts the next reel. He hasn't turned any knobs or changed the machine settings from the night before; nevertheless, the machine hasn't reached operating temperature yet, so the framing ends up slightly different.
I've imagined a scenario like that ... but he would've been using 1000ft reels in that case.

Now let's throw that idea out the window.
Let's imagine the shrinkage was introduced earlier, whenever the 1k chunks were printed onto 2k reels.
Then the 2k reel suffered the blob damage later in its life.

Is -1 following this thread? I wonder if he could provide uncropped images of these four frames.
If we could see those frames uncropped with sprocket holes and all, do you think their exposed areas would align?