I was reading something else this morning that got me thinking about the skeletons in the caves.
They were referenced in Through the Looking Glass (god, I hope that's the right episode). But I wonder, will the mystery be addressed, as to who they represent? And should I, for any reason, already know who they represent?
Perhaps this question has been beaten to death. I am hoping we find out tonight. Maybe it has to do with Jacob and the MIB's lineage? Maybe it has to do with people who sailed the Black Rock?