Case Study and Research Project Clairication
Finding a case for the research project does not mean that you are limited to the company identified in the case. Rather it is to identify an issue identified in the case that this company was grappling with.
That issue is to be the topic of your research paper and the other 5 sources you find are dealing with that same issue, which becomes your research question. That question will be answered by your research and the sources you have found or will find.