I am going to say that it appears that there is unjustifiable justification...
I think maybe you need a vacation
Kidding aside, I look at it this way:
- I think we've established that there is no requirement as such, for everyone to know who the MR or CR is.
- That leaves us with the question or not of whether the answer to the question is potentially useful, or, depending on the person asked, significant with regard to the requirements and functioning of the system.
I think that aside from basic leadership responsibilities the prime responsibility of "top management" is effective delegation of responsibility and authority. The standard is explicit in this regard in describing the office of Management Representative:
Top management shall appoint a member of management who, irrespective of other responsibilities, shall have responsibility and authority that includes...[emphasis added]
So as I suggested earlier, it depends on who's answering the question. The janitor will probably not be affected by not knowing who the MR is. But if "top management" doesn't know--and I have seen at least one instance where this was the case--then how can we convincingly trace the chain of delegation of responsibility and authority?
Admittedly, this is an extreme case, but I think we need to look at this from the perspective of R&A. There are too many people who are given responsibility but no authority, and the further up the food chain you go, the more likely you are to find those who have authority but take no responsibility--delegation is synonymous with scapegoating. Auditors need to be better detectives, imo, and be able to make reasonable inferences from the evidence at hand.
So if the question is, "Does it make any sense for third-party auditors to ask auditees to identify the MR?", then my answer is, "It depends on who's being asked, and why."