Looking at mine, this actually makes a lot of sense to me. I could see the further-from-the-edge being the first attempt, but the ring didn't sit right, so they went it a little closer to the edge, and that still didn't work, so they threw some rivets in the holes and moved to and endcap ring. The only place this falls apart is the different size rivets, IMO. The different size rivets kind of tells me that they were installed at different times, otherwise they'd likely be all the same size...
The M Knight Shyamalan twist ending would be that if we've spent a bunch of time trying to understand why those rivets are there, but they were actually installed by the RAF for some unknown reason decades before they even had a hope of being on screen.