The reason why the narrator calls the relationship between Mr. Utterson and Mr. Enfield "a nut to crack for many" is because people did not see what they liked about each other
This refers to the telling of a story through the aid of a narrator, showing the sequence of events.
Hence, we can see that from the complete text, there is the use of narration to show the relationship of Mr Utterson and Mr Enfield as they were very different and thus, people did not see what they liked about each other.
Read more about Mr. Utterson here:
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