There is no need to restrict yourself to "team conflicts" for insightful leadership situations, it's much more about interpersonally challenging situations. Team-wide aspects for leadership examples include
- How to initially form a team (especially if the team is working on a pro-bono basis without additional financial benefits)
- How to align the team and make everyone feel comfortable with the "big picture/vision/mission" of the venture, so that everyone can see himself part of it
- How to motivate the team after a severe setback (e.g. project funding was unexpectedly cut because of economic downturn, change of management etc.)
- How you coach/mentor the team to make the whole team successful
Hope that helps as some inspiration! Since it's a common question, I also included those details also in the Ultimate McKinsey PEI Prep ebook, in case you need more guidance on the McKinsey PEI.