CREATE TABLE table_4985 ("Res." TEXT, "Record" TEXT, "Opponent" TEXT, "Method" TEXT, "Event" TEXT, "Round" FLOAT, "Time" TEXT, "Location" TEXT)

Who did he fight in Rumble of the Kings 6?
SELECT "Opponent" FROM table_4985 WHERE "Event" = 'rumble of the kings 6'
SELECT "Opponent" FROM "table_4985" WHERE "Event" = 'rumble of the kings 6'