Why Are Dansco Albums Missing Spots For Silver Proofs?

Dansco does what they want and adds holes for coins that makes sense in their universe, can anyone explain why the Lincoln Cent album has a hole for the 1922 plain? What I do to solve this problem is I buy a blank page that fits the coin in question, insert it in the back of the album (my Dansco 8125 album now has 7 pages), then I use a label maker with clear tape to add dates and notes for what varieties I want to add to that collection. It doesn't have a fully professional look to it but it works for me. Below is a picture of what I did to my 8125 album.

The key here is that Dansco refers their albums with poof holes as "including proof-only issues." That is, they have extra holes for when there is only a proof issued for that date-mint combination.

Since all proofs from 1964 and earlier were minted in Philadelphia, there will only be the one hole since there were both proofs and business strikes made there. You are forced to choose which to place in that hole.

This is also why you do not see proof holes in the 8100 Lincoln cents album for 1968-S to 1975-S and the 8113 Jefferson nickels for 1968-S to 1970-S.

The oddball, though, is the 8166 Kennedy half dollars album. It not only has a separate hole for the 1964 proof, but has holes for the 1965-1967 SMS issues. Go figure.