I asked the same question over at the psa board and got the same answer. I don't the po report is the best indicator for the ratio because I know psa only started to recognize the different backs over the past few years. I just randomly discovered a 64 pele that I got a few years was a Valida back but it's not noted on the slab. That being said I have only seen one nice Ali Valida back and it's in a bgs 7 slab but not noted on the flip. Most of the ones I have seen for sale have back damage so if you are collecting for condition... I think the 66 Valida back is one his more difficult in a high grade.
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