Some extractors are very hard to get out, and yes the mark is above the hook, that part is inside the slide, and you can’t compare 2 guns from different manufacturers, the reason, it depends on how they adjust and fit the extractor, I still say it’s a drag mark from removing it, there is no way an round could/can cause that mark. I’m no expert but with over 30+ years with various 1911’s, and having seen weird things with them and how some manufacturers fit parts, you would be amazed, also the extractor will move back and forth a tiny bit as the round gets chambered due the the normal spring type action of the extractor, which also could cause/help make that mark