To me, it looks on the face of it that a pertinent chapter (at least on the obvious issue of Darwin's and Wallace's plagiarism) is to be found in TRANSLATING NATURAL SELECTION: TRUE CONCEPT, BUT FALSE TERM? by Thierry Hoquet pp. 67-96 2013). What is interesting is that in this publication Hoquet cites Matthew's original, and prior to Darwin's and Wallace's supposedly miraculous independent 1858 replication of Matthew's theory, coinage of the term "natural process of selection". Hoquet notes Darwin (1859) wrote 'process of natural selection' in his book The Origin of Species, but that four-word shuffling of Matthew's term does not appear to interest him.
Those questioning whether or not Darwin plagiarized Matthew, are of course alerted to the fact ignored by Hoquet that Darwin has originally four-word shuffled Matthew's original phrase into his own regeneration of it.
In my book (Sutton 2017), I point out why a plagiarist of Matthew's theory of evolution by natural selection would risk such a thing. My own guessed reason for that is because Darwin had no choice, because the theory is about (1) "selection" that is (2)"natural" (as opposed to artificial) and is a (3) "process". Therefore, Darwin would have felt he had no choice but to regenerate by four-word shuffling Matthew's original term for the concept he plagiarized from him, otherwise Matthew's theory could not be explained as well as the originator explained it before Darwin stole it. NOTE: I am most grateful to Hugh Dower for for sharing the pdf containing Hoquet's publication.