yeah, basically. it just boils down to which two. sawyer and jack?
What about Hurley? He seems to be the one most in tune with the island. He's the only one that can see and hear Jacob after he died and who's given him tasks. Not too sure if he can communicate with the dead though, that could have been Jacob pretending to be Charlie and then Isabella since we know MIB can appear as other people.
Also wanted to point out, wasn't Isabella wearing modern clothes?