Start Burnes and let the opponents load their lineup with lefty bats, then bring in Gio in the 3rd or 4th innings. Why not just name Burnes the starter, allow the opponent to turn in their lineup, but change yours at the last second. Or just use up Burnes that day without throwing a pitch with the expanded 40-man depth. Do it again the next day, until the opponent figures it out and doesn't throw all their left handed hitters in there?