I think that RJ is Bret Stiles.
We know that RJ is afraid of heights.
Kirkland and Partridge are dead.
Haffner is afraid of spiders. (we saw that in the hotel room)
McAllister is afraid of birds. (we saw that on the roof of the chappel)
Bertram was send by RJ and that mysterious organisation to find out what Jane knows.
Smith said to Kirkland before shooting him in the back that the organisation is recruting mid and low level agents too. So he is one of the recruited making it impossible to be RJ.
That leaves Bret Stiles.
What do you think about that?