From the SAR Preparation Guidelines:
Items 45, 46, and 47 - Contact Person’s Name - Enter the name of the person who can be contacted for additional information. It would be extremely helpful if the individual identified in this section has specific knowledge of the underlying facts.
This is the only guidance available. I suggest banks use the same contact person on all SARs. Assuming your SAR filing program adheres to the concept that every aspect of your BSA program is supported by "four pillars," you should have a named individual responsible for SAR filing - that's your contact person.
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In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.