to support Wm being of Kk German and older than the Braddan Wm - a Wm Corkill was a member of Chapter quest of Kk German in 1727 - not possible due to age for this to have been Braddan Wm;
The presentments (wch also include defuncts ) have a defunct Wm Corkill Cronkdhoo for 11 Dec 1763 (can't see him in burial reg tho but the Burial reg for Kk German starts a new book in 1764 so possibly missed out from old section)