I would like the same people that analyzed the Book of Mormon and found different writting styles for different prophets take a look at these works of art side by side.
I am not convinced that they are from different sources.
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Our Father told us about Christ's disciples being fishermen, and we were to assume, as my brother and I did, that all first-class fishermen on the Sea of Galilee were fly fishermen and that John, the favorite, was a dry-fly fisherman.