Barb, I believe you are right, that Allison and Justin have a deal not to nominate each other right now. With that said, I am seeing Nathan (definate, the three stooges said so more then once) and probably Jack. Jack is more important to the opposition so if any of them gain the veto they would save Jack, thus leaving the target Nathan up for eviction, IMO.
To be honest I would put up Jack and Erika, to divide the opposition since both are strongly in the opposing camp. Nathan is to much of a loner, but Jack and Erika are the two that keep their alliance going. With that being said, I don't think the 3 stooges are that smart.