Lisa and Sara are only friends through necessity, everyone they were genuinely close to has gone and no one else in the house likes them so although they are friends I don't think they will be out of the house.
Mo is desperate for Rex to love him, but to no avail, Rex is only interested in himself and pretty blondes.
So it has to be Rachel and Kat for me, I think Kat uses Rach a bit though
