Reply to Diamond Sue:
Forgive the long delay in responding to this. The only John Maclean who would qualify as an Auchnasaul Maclean of whom I am aware is John, son of Hector, 2nd laird of Auchnasaul. Maclean-Sinclair identifies him as "John Og in Auchnasaul -Mull" (From Clan to Regiment, p. 710) and indicates he is referred to in documents (unidentified) dated 1661 and 1692 (Table 7). He may be one of the descendants of Hector who Sinclair states went to Ireland (p. 397). I am working on the theory that he was the John McLean who was in Antrim as of 1709 and was a member of the Antrim Presbyterian congregation - my 7x great grandfather.
Although Sinclair identifies Hector's brother Donald and his issue as the Macleans of Auchnasaul, they descended from them and lived on Gunna, Coll and Rum. (The Auchnasaul Macleans were limited to Allan, Hector and Donald (Hector'sson), 1st, 2nd and 3rd lairds respectively. Donald drowned in 1687 and the cadet expired.) Since Sinclair treats Hector's brother Donald and his issue as the Macleans of Auchnasaul, he may be referring to Donald's grandson John as the "John Maclean of Auchnasaul" who married Una. That John served under Lachlan Maclean of Coll in the Scots Brigade in the 1680s. (Clan, p. 201).
Hope this helps, sue.
Douglas McLean