Yes, good idea to eliminate John Stole if you can.
The two Johns were the closest in age to Ellinor Casement, but if the parents' permission referred only to Ellinor there would be other older John Corkills she could have married.
Donna, is there a Maughold MI for John Corkill & Ellinor Casement (b.1762) by any chance? Thanks.
Sue