I think that Jacob had set up Sayid to die before anybody even boarded the plane to return to the island. I'm sure that the note said something like "Make sure Sayid dies". It all seemed to coincidental that Jacob gave Hurley the guitar case, then told him to take it to the Temple. Now the question is, is that actually Sayid? I've always subscribed to the theory that "dead is dead", so I get the feeling that Jacob has taken over his body or something.
Disagree on the note. If Jacob wanted Sayid dead, why didn't the Others just shoot everyone? (as originally ordered) Why did they indicate it was important to save Sayid? (something to the effect everyone was in grave danger if Sayid died).
My view is that they intended to save Sayid. The spring water appears to be a "fountain of healing", but it wasn't quite working properly:
- someone pointed out it wasn't clear anymore--unbeknownst to them, Jacob had been "killed", and that likely affected the water's colour/clarity
- the leader cut his hand and dipped it into the water--I assume that was to test whether it would heal his hand (it didn't...)
Perhaps the water worked to save Sayid after all, just a little delayed.
One question related to a theory of mine. Was Sayid the person most recently touched by Jacob? (crash scene). Hugo's visit with Jacob in the taxi was obviously more recent than Sayid's, but it didn't necessarily include a touch. I'm thinking that touch is very significant for Jacob's survival. We'll know soon enough I guess.