Grading standards have changed over time. The original PSA 9 1980 Topps Rickey Henderson was graded some time ago, quite likely during the Baker/Rocchi era. Since then, some types of printing defects have been judged with greater severity. "Snow" or imperfect printing in dark, background areas where small specks of white can be seen is one such defect. It appears that there's a hint of that on the original PSA 9 Henderson. That may have been the reason for the downgrade when you cracked and resubmitted.
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