Hello Jesse. I like the dutch ovens too, Griswold and others as well. And I have noticed a lot of differences in them as well. We have talked about them "shoulders", thats what I'll call them, on here before. All kinds of ideas came up.
What about this one Jesse? If you stack up the lids with the shoulders, the shoulders keep them separated so you can get them off the stack, for quicker handling when they were being packed at the factory. I don't know, thats just what I thought, maybe, what do you think. I don't think they serve any purpose for the structural integrity of the lid.
Also, on Griswold Dutch ovens. Did you ever notice this? The crazy little number 6 dutch oven, has a huge handle on it, for instance, I can get three fingers under the handle, BUT, its great big brother, the number 13 lid as a little bitty stupid handle on it, and I can only get two fingers under that handle. That is, even though the number 13 lid weighs more than the whole number 6 dutch oven. And they came with different size handles, not all the handles were the same size, even though it is the same size dutch oven. BUT, I have never seen a number 13 with a big easy to grab handle, but seen plenty 6's.
OH Jesse, does that answer your question? ;D
OH, and them dutch ovens look like you did a nice job cleaning them. I cleaned some iron this weekend in fact. Even though I have been cleaning iron for some time now, I still learn something each time I clean.