The T206 "Honus" you show is no longer in the pop report, FWIW.
Some of those early grades are gifts, some are probably due to chemical treatments returning years after the card was slabbed.
My biggest grading issue has been cards that deserved the MK qualifiers that did not get them:
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Three red marker drawings got a straight PSA 5?

Pencil writing on the back of this Ty Cobb HOF postcard and it got a straight PSA 4. MK is supposed to be one of the qualifiers that you cannot get removed, even if you request No Qualifiers.