I am the first author for a review paper with ~10 authors. I wrote the full first draft entirely alone (about 8,000 words and 200+ references). Then, I opened the (very polished) draft to all authors for contributions.
Some authors made very small revisions. Another author (Author A) sent me one page of text, and asked me to add parts of it if I wanted. I did add their text throughout the manuscript.
While preparing for submission, I asked each author to add themselves into the CRediT system. Later, I noticed in the "author contribution" section that 3 names were listed as "Writing-original draft": Myself, Author A, and Author B.
I understand why Author A listed their name. Even though I wrote the original (very polished) first draft entirely alone, Author A did later write one page of text... enough to warrant more than a "Writing-revisions and editing" contribution. So, I agreed with that.
However, Author B not only did not write anything substantial, they did not write anything (even a single minor revision) at all. The document has lived entirely on Google Docs, so I can see they made not a single revision or comment.
Author A and B are both senior authors. In my head, I imagine two scenarios:
Author A and B both wrote the full page, and only Author A sent it to me. In this case, Author B deserves the credit.
Author B noticed that Author A listed themselves as having written the original document, and assumed they could just do the same. After all, Author B could not see that Author A wrote a full page separately, since they sent it to me behind the scenes, and I added the full page directly myself (under my name on the Google Doc). In this case, Author B does not deserve the credit, and acted unethically (in my opinion).
In any case, I recognize it is unfair/useless for me to make such assumptions. I would like to know the truth, and I plan to ask Author B.
I have not seen many questions like this on StackExchange. I see much more authorship byline questions, but not so much authorship CRediT questions.
My questions are:
Is the culture around author CRediT creating this possibility that Author B might have acted unethically? I'm sure it varies across fields (I'm in biology).
Is it even worth asking Author B? I suppose this depends on Question (1), and, if it is ingrained in the culture for a senior author to claim CRediT unfairly, then better to just move on and not work with them as much? I am only at the graduate student level; Author B is a professor.