Advice on WR/Flex Start

Ive got a dilemna on who to start for week 2. OBJ is my #1 WR and then from there I have Cooper Kupp, John Ross, and Michael Gallup to choose from for my #2 and flex spots. Im leaning towards Kupp for my #2 and Ross for my flex especially since AJ Green is injured but im not sure yet. Any advice would be appreciated.