Richard F. Keeler makes argument for identification of Mr Couch.
Richard F. Keeler, "Mr. Couch and Elder Roberts" Dialogue: A Journal of Mormon Thought, 29, No. 2 (Summer 1996): 146
The circumstantial evidence indicates that it was James Fitton Couch who drafted the questions that so interested B. H. Roberts.
This paper discusses the potential identity of "Mr. Couch," whose questions led B. H. Roberts to produce his Book of Mormon Studies.