I watched the video, and here are a couple thoughts from someone who has never submitted a card for grading.
Grading is so inherently subjective, even with (allegedly) objective standards that a grade difference of 1 is going to happen and most likely frequently - that's simply a bug in the system that has to be accepted. However, changes in 2 grades are much harder to take, and especially at scale are troubling, and changes in 3 just cinches the case.
I will say that that 1957 Football Johnny Olszewski with serial number ending in 303 that shows a 5 is probably over graded - you can clearly see what looks like warping, almost like water damage.
Final thought - I would LOVE to explore his shelves in the background.
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