When the Hybrid refers to “the Chosen One” to Baltar and D’Anna, I think each thought the Hybrid was referring to him/herself. And it did appear the Hybrid was looking directly at them, or perhaps directly at Baltar. However, I think the Chief is the Chosen One. Didn’t the Hybrid also mention something about the Chosen One entering the temple?
This would also explain why the Chief is drawn to the temple by some force that apparently no one else around him can sense. Cally also remarks on his sense of “reverence” when he’s inside the temple, and the Chief reminisces about his parents’ spiritual and religous teachings while there. (I love the naked dancing and porn magazine story, btw.)
So, what is it about the Chief or about the monolith that draws him there? Someone commented recently about the possibility of an Adama bloodline tracing back to the Thirteenth Tribe. What if the Chief holds a bloodline that can be drawn back to a significant figure in human/Cylon religion, such as the lord of Kobol who broke from the others and may turn out to be the Cylon god?
Provided that the temple and the monolith aren’t destroyed by nukes, I think the Chief can/will decipher the writing inscribed on the monolith and find out the true meaning of the Eye of Jupiter – assuming it’s not merely the painted target-shaped circle at eye level in front of him.