Don't know about the above case studies. But, I think carrying a range of spectrum of force options problematic. We are not LE and do not have an obligation to engage others in multiple scenarios that might require varying degrees of force or use of compliance tools. It also creates complexity in decision making. Don't use this tool or that tool? Will this tool be sufficient? What if choose the wrong tool? What if it escalates? Can I transition from this tool to another tool? How will I do that in the middle if a dynamic situation? (Fight) Where will I carry this tool? It may also have legal complications. You were carrying pepper spray, why didn't you use it first?
Choosing to go to gun and doing so effectively is already a difficult proposition. To think that you have time to make a carefully considered spectrum of force decision from your tactical utility belt is misguided. It's better to simplify decision to either the situation requires lethal force or not.
Just my perspective.