I don't care what you think, I like to believe Genji took this photo. All four of them were friends during the golden years and I will die on this hill. Also him taking a photo but not wanting to be in the photo makes sense for his character at the time.
Another thing, all four of them still have this photo, not just Pharah.
They finally have an interaction together I'm going to cry-
Cassidy canonically plays sports with Pharah-
ANGELA USES THE BUMPERS WHEN BOWLING-
This is my new favorite interaction. More like this please. It just... shows how close they all are, that Cassidy and Pharah are so close to Angela that she doesn't really ask if she can tag along but if she does tag along if they can use the bumpers. She doesn't feel like she's intruding because she knows she's welcomed!
She wouldn't do that if she was just close with Pharah either, cause this is Pharah and Cassidy sibling bonding time, she wouldn't join unless she was close to both of them and knew she was welcomed.