For anybody that hasn't seen this video, it shows the cards in extreme close up detail. To be honest I would be shocked if the 52 mantle is over an 8 or 9 with todays standards. The corners have visible wear, particularly top left and the surface has print defects. I actually like seeing some kind of wear it makes the card to me seem genuine and not altered. I'd love to see a tape measure over all of his psa 10 cards just out of curiosity sake.
Though I would like to say this, in a world of understanding these would all be 10s. The way grading has gone is comical, and I hate to rehash it. But old grading really was the correct version, vgex 4s looked like vgex cards. 6s looked like ex+ cards. Now a days 3s look like near mint 9s and 1s can be torn in half to looking like 8s. You see people with old label 5s and 6s that have a soft corner or 2, or whatever but the card is still easily in the ex range and people say those aren't 5s or 6s today, yet the card would fit any collections ex binder without a single blink. That same card people are happy to get a 2 on today because one corner is slightly soft. It is incomprehensible.
Rant over. I could type about it forever.
https://youtu.be/wVGrUMyZSB4