Hi, TeamJLA. Welcome. Overthinking is what this forum is all about. We don't do simple here. Asmo had the same idea about "lies" meaning fibs. His answer was Ben.
I'm thinking the two supernatural beings represent Fate/Free Will. Jacob is free will. He scorns Ben whose slavish devotion didn't impress him at all. Maybe he wanted Ben to exercise some free will from time to time. He welcomed Locke who is kind of a rule-bender. And he believes that Man is evolving. Until it's really over "Everything else is progress." Man can change. "Essau" says "It always ends the same." That would be the Fatalistic viewpoint.
Another theory of mine is that Jacob has influence over the living and "Essau" influences the dead. I don't believe either one of them is good or evil.
Does Fate/Free Will only apply on the Island in regards to Jacob and his Island friend? Jacob pushed Sayid from a more Fate side by letting Nadia get killed. I know Free Will sent her walking across the street but Jacob intervened with Sayid causing her to stop and turn back around instead of continuing across the street. Not to mention all his encounters with all the Losties seem to be more him trying to influence their Fate through Free Will and he even mentioned 316 to Hurley. If you are correct in your theory then Locke has always been on the side of Fate/Destiny and that is why he made a perfect pawn for "Essau". "They are coming" leads me to think Jacob is counting on Jack,Sawyer,Kate,Hurley and Jin as proof that man can change.