Even knowing brite gunner and brite bomber are in the same set it makes no sense why the shadow skin for brite gunner is part of the same set as dark bomber :
Fortnite Dark Bomber
Fortnite shop UPDATE: Dark Bomber skin available to buy TODAY at a great price | Gaming | Entertainment | Express.co.uk
Fortnite' patch v9.30 adds tons of new cosmetic items, including new Shadow Legends pack