The IS-GW is available to the pilot who achieves the highest combined score, regardless if he has flown all four battles. For that, battle scores will be added. Any battles not flown by a pilot will have zero score. All TIE Scores are laserless.
IS-GW for highest combined score for all battles,
Competition runtime starts on the first day at 00:00:01 UTC, and ends on the last day at 23:59:59 UTC.