[Spoilers main] what if scenario. Robb stark.

What if Robb accepts the suggestion to support Renly does not become the king in the north and brings a strong part of his host to bitter bridge and they agree to work together.

Then Stannis sieges storms end and Robb joins the Parlay where stannis calls him a traitor and tells him to join him and Robb says he needs justice immediately and renly is his best chance.

Then as per shadow baby kills renly.

Does Robb in this situation join Stannis or do something else?