One of Allan McLean's descendents informed me that he and his family - after being 'cleared' from Arichonan, North Knapdale - had emigrated to Ekfrid Township, Middlesex County, in Upper Canada. Furthermore, Allan and his wife, Catherine Campbell, were buried in Murray Cemetery, also in Ekfrid.
So, with the help of 2 Ontario researchers, I have been able to add a page to the "Leaving Knapdale" section! Lee Dickson (lee dot dickson at sympatico dot ca) found the McLean family in the 1851 and 1861 census', plus the Agricultural Census that went along with that information. Art Currie (concur at sympatico dot ca) sent me the transcription of the McLean gravestone, PLUS photos of the cemetery, etc. I have included all of this at Knapdale People, "Leaving Knapdale".