Will is that of Edward h/o Jane Sayle - petn by Jane Corkill(widow of Edward Corkill) - court 13 Apr 1820;wiil: undated;2 unnamed children(£10 Manks ea);, unnamed mother (black silk hankerchief);nephew John Lord;wife Jane exex;pledges John Sayle(Maughold) + John Caley(als a wtness with Edward Curghey); Sumner calls Wm Looney + wife Eleanor, John Caley + Thomas Lord [ ?John Lord is s/o Thomas Lord + Leonora Corkill - Leonora is d/o John Corkill + Elinor Casement and sister of Edward Corkill - Edward m Jane Sayle Mau 18161123 who married Hugh Lord Mau 18250514 ]
Thus no help in determining who schoolmaster was.

however the mortgages are more interesting
NSM Oct 1763 24 - dated 28 Apr 1763;James Corkill(Ballasloe) + wife Catharine als Crow mortgage for 5yrs for £11(Manks) to James Cottier senr (already paid at the chuch of Kk Maughold) a field of our qtrland known as Boully-dowin already fenced about adj Wm Callow(Ballafayl) on northeast, Tho Quayle on southeast, sd Callow + Quayle in SW and the highway that leads from Kk Maughold church to Corna Miln on northwest . Corkill to continue in premises paying annual lawful interest;Witt Samuel Christian x, Wm Christian;Setting quest place 2s 6d rent
and Cottier surrendering mortgage to John Corkill NSM Oct 1776 27 - dated 20 May 1775;James Cottier(Balla-Keil) surrenders for £17 13s 2d to John Corkill(Kk Maughold) to discharge a mortgage principal sum £11 bearing date 28 Apr 1763 obtained from James Corkill of Ballashloe + £6 13s 2d being arrears of interest;Witt Wm Kermode, Dan Cowll

the sum mentioned is nowhere near that in deed of sale - no other mortgage I can see by James Corkill -
If John was s/o Cath Crow then suspect he was illeg child bapt Mau 17391223 - that meant he was eldest child of James but being illeg couldn't inherit - was the mortgage + deed a way around this + a mechanism to defraud Edward?