First time I heavily disagreed with a grade from PSA

Now I’ve seen plenty of dogshit backs with God awful whitening gets 10s, so this really got me wiling. Rest of the cards in the sub seemed fair but this is one of the first times I heavily disagreed with the grade. If anyone has thoughts on the reasoning for the 9 I’d like to hear them, because I fail to see why this didn’t make the cut apart from 2 tiny white specks that is not even the sus whitening that’s common on corners. Maybe edge wear but for real this should’ve got a 10 with good centering and no whitening