ok sooo this has been bothering me lately. So in season 5 mib was pretending to be Locke. Richard and Ben didnt realize he was the MIB. Richard only realized this when MIB said "good to see you out of those chains". So even after he saw lockes dead body he still didnt know it was MIB. OK so here is the plothole. Dogen tells Sayid that the MIB will appear as someone who is already dead......how the fuck does dogen know this???? And if he does know this why doesnt Richard or any of the others???????????