There is a theory going around that the player is the new Cyric and is destined to ascend to godhood or at least use the godsword to destroy the Dead Three.
That sounds more like a very high level story. BG3 will only go to 12 or so. An interesting option would be to pit the various entities against each other. Sharrans vs. Githyanki vs. Absolute (whatever it is) Bhaal being involved makes sense for a bit of continuation but if the dead three really want to hind behind the absolute they should not use their symbols everywhere. "If you are coming from iraq, why is there a US Air Force logo on all of your planes?"
I sometimes use thought experiments. I don't necessarily believe in every idea I post for discussion on this forum
