Hello folks,
Wow, thank you for all this help, and so quickly too! It's a lot to digest.
Monica, you are absolutely correct about the deaths of John FLETCHER's parents in 1883 and 1904. You are correct too that Mull was the land of the FLETCHERs! Different waves of them went over to Mull during different centuries. My father is the last Glenorchy born FLETCHER (1931), although his great grandfather, Alexander FLETCHER, had migrated to Mull nearly a century before, and then the subsequent generations returned to the mainland. Recently, my father did Y DNA testing and matched with a Mull FLETCHER who had long been told that they were different FLETCHERs. The FLETCHERs were cattle drovers. You find them in places like Mull and Islay where the cattle grazing is excellent. This is likely how they became entangled with the MCPHAILs, other historic cattle people.
Monica, the second family you mentioned, the ones at Derryguaig in 1901, are the correct ones. They are also the same family found at Achnacraig 10 years earlier. Not sure why it says John rather than Colin though ... odd. Too young to be John, who would be 33 by then.
Fifer, yes John's sister, Catherine FLETCHER, did marry Allan CAMERON. My father, now almost 84 years old, remembers them. Allan was some way related to Margaret CAMERON who was the wife of Catherine's brother, Colin FLETCHER (that you pointed out on the 1911 census at Ardchrionish). I met their eldest son, Alexander (known as Alisdair) FLETCHER, shown on that census. Colin FLETCHER's son, also Colin (age 3 in 1911) has a daughter living on Mull today. I know her as well. The nephew that I mentioned in my original post, the one who took care of John FLETCHER's final affairs was this younger Colin FLETCHER, born about 1908.
Thanks again, folks!