I was hoping someone did a screen capture of the headstone! I have a feeling the headstone is ceremonial. Can we be sure Sayid is one of the 6??? Yes he is off the island but so is Ben, maybe they left another way.
The more we watch the more questions we end up with, and no, I can’t be sure about anything with this show. ;-)
I’m pretty sure we can. Right before he kills the guy on the golf course, he introduces himself as one of the Oceanic 6.