to be honest, i am not sure if this has been talked about before, i am just too lazy to look ...
In both cases of Yemi and Christian ... their bodies were gone after being "occupied". Christian's body was not in the coffin and Yemi's was not in the plane, yet Lock's was still in the coffin. why????????
come to think of it ... John (or the MIB) saw Elana's group securing the box (containing the body of real JL) and THEY saw him, why didnt they do or say anything? and couldnt he tell it was there? he had to come to the body to occupy it, right?
here is the kicker, the MIB took John's body, but didnt bother to hide the actual body from other survivors to see? why? is he not concerned someone might find it? why not ?