I do have a thought about Sayid.
Sayid has apparently been 'claimed' (possessed?) by the smoke monster or one of its agents.
The list in the Ankh was emphatic that certain of the lostaways needed to be alive - which Sayid is, thanks to being 'claimed' - but nothing was mentioned of allegiance.
My suspicion here is that being 'claimed' works two ways: yes, it gives somebody (Smoke Monster?) a human agent - but it also gives the people that agent interacts with an insight of sorts into the one doing the Claiming. That is a channel which somebody who is clever or lucky might be able to take advantage of.