Hiku said: No, she didn't pick anyone. This is what the wiki says: Dajh stumbled across pulse l'Cie Vanille and Fang, who were preparing to attack Kujata. Sensing the danger, Kujata awoke and branded the nearest human as his protector and Dajh became a Cocoon l'Cie as Vanille and Fang escaped. |
Oh, right. I remember a cutscene of Vanille holding Dahj hand, so I got confused with it.
So, yeah, Vanille and Fang tried to attack Kujata and Kujata tried to defend itself. It's still Vanille - and by extention, Fang - fault that Dahj got branded in the first place.