CREATE TABLE table_204_747 (id DECIMAL, "season" TEXT, "skip" TEXT, "third" TEXT, "second" TEXT, "lead" TEXT, "events" TEXT)

who was the lead before pat mccallum ?
SELECT "lead" FROM table_204_747 WHERE id = (SELECT id FROM table_204_747 WHERE "lead" = 'pat mccallum') - 1
SELECT "lead" FROM "table_204_747" WHERE "id" = (SELECT "id" FROM "table_204_747" WHERE "lead" = 'pat mccallum') - 1