It's probably something similar to the point made in #QualitativeLiteracy (@jessicacalarco @MarioLuisSmall). You need to show heterogeneity within your case, even if some do not fit with your conclusion. In that way, you can somewhat avoid suspicion of selection bias.
As I'm preparing my talk about qualitative research and translating #QualitativeLiteracy in Korea, I found that many of these jobs address the question of what the scientific value of case-specific knowledge will be. Any lit recommendation? Mine is: https://journals.sagepub.com/doi/full/10.1177/0049124119901213
Korea-based folks. If you know a Korean publisher who may be interested in publishing #QualitativeLiteracy, please let me know. I have been translating this book with my co-translator for a month, and now we are ready to send the proposal for publication. https://www.ucpress.edu/book/9780520390669/qualitative-literacy
Qualitative Literacy

Suppose you were given two qualitative studies: one is a piece of empirically sound social science and the other, though interesting and beautifully written, is not. How would you tell the difference? Qualitative Literacy presents criteria to assess qualitative research methods such as in-depth interviewing and participant observation.

University of California Press
Translating @jessicacalarco and Mario Small's #QualitativeLiteracy in Korean slowly. I think one of many important keywords of this book is cumulative social science. This ideal matters because it could be a way to recover solidarity among scholars.