Are you suggesting that there couldn't possibly be TWO people who have had the name of John Mytton since the 1800s?
Along those same lines, how about this farmer in Australia who has a name I'm kind of familiar with.
My father, born in 1908, had the unlikely name Alcide John Payette. When I began genealogical research, I was astonished to find, in Hawaii, the grave of Alcide John Payette, born in 1908. It wasn't my father. On the other hand, my father never felt the need to resort to sock puppets. If there is another Lance B. Payette (other than John Mytton, of course), I've never stumbled across him.