Rob, The Stewart / Boyd / Knox / Adair connection seems to be going round in circles.
Refer to message 487 of the Knox family forum where it states that Capt. James Stewart, 2nd son of Lord Ochiltree, b-in-law to John Knox, the Reformer (and therefore b-in-law to Wm. Adair ?) was elevated to rank of Earl of Arran 1581.
Refer also to message 413 on the Boyd family forum by Neil Gill.
Then there is Blaney Adair of Ballymena connection with Boyd (refer the Belfast newspapers site in previous messages)where he was a tenant of Boyd (Arran ?).