Hi all. I rewatched "Dead is Dead" today and saw something interesting.
In the scene where Flocke guides Ben through the jungle, on to the temple. When Ben recognizes the path, he talks about how they're going to "our temple" (The Other's). However, Flocke quickly says they're not going that way, they're going underground. Ben then gets surprised.
It gave me the impression Ben didn't know (or didn't really cared) about that passage. But then again, Richard, in a later episode, talks about part of the Others group being at the temple. Maybe they never used the underground tunnels. Maybe that area always "belonged" to Jacob's enemy.
This, of course, reinforces the theory going on about the monster.