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Lee BehrensOne thing that must be remembered with Bill's data is that he is looking for only one of each back, not the total number of cards and backs. For all we know there could be only one of each back 460 in the 460 (say Sovereign) only series 48 total, or 25 each of 0nly 20 (500) (say AB) of the cards. By using Bill's data collection it looks like the Sov would be the easiest but yet there are plenty more AB's.
So using Bill's data does not work the best for this scenario of back rarities. What it may show is that not all cards exist with each possible back.
Lee