At first I thought it was the difference between first page and subsequent pages (first page got the numbers, everything else didn't). Wrong.
Then I thought it might just be that only one, or the first, Authorship result on a page got the numbers treatment. Wrong.
Could it be per Author?
My Request: Do a search in Incognito mode and find an author that does not have the numbers treatment. Then continue to perform searches for that author's specific content to see if you can find a SERP that includes a numbers treatment.
You can do the same but for the inverse (looking for an author that does have the numbers treatment and looking for examples where they do not.
Extra credit if you do it in incognito, logged-in personalization on, logged-in personalization off.
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