You are quite right about this, and I was quite wrong.Currently, survival skill of your companions are not using in hunting process. But Ranged skill does. For every companion that have ranged 40+ you will have +5 chance to successful hunt.
Team A:Aria, May Lin, Juno, Caitlin: Survival 197, only Aria it´s above 40. Neither Aria or May Lin, that are in the Main Slave role, have the Wild Born Trait.
Hunting Chance: 74
With June as Main Slave I, with Wild Born trait:
Hunting Chance 74
With June and Caitlin as Main Slave I and Main Slave II, both with Wild Born Trait:
Hunting Chances 74
Team B: Dexter, Aiko, Bud, Loren. Survival 90. All of them above 40.
Hunting Chances 89
Team C: Ansel, Peasant, Mr Doyle, Aria. Survival 193. All of them above 40
Hunting chances 89
Seems that the Survival of your team have no influence at all in your hunting chances.
Seems that the Wild Born trait have no influence at all in your hunting chances
Seems that the only thing that matters is if your team members have Ranged skill above 40 or not .+5 per each
May be then some of the developers can bring some light about what use it´s the survival skill of the NPCs. All of this seems deeply counterintuitive to me.