[3/8/2016] Chiliad Mural is overlooked

I've been looking all over the map for clues or X marks which are shown on the mural, the only clue which caught my mind is the jetpack logo at altruist camp which appears the same as the mural one but on a stone. The problem is, the jetpack sign on the mural is on RIGHT while altruist camp is on the LEFT part of the map (unless if you invert the map which makes no sense). So the logical explanation for this mural is obvious as clear sky. It's a reference to the story mode and how you can unlock the chiliad UFO. The alien craft on the left is Michael, Middle cracked egg is Franklin and the guy with jetpack on right is Trevor. The line connecting to Michael and Trevor from below is the Prologue and the story they had with each other. There are glyphs on the cliffs at X mark locations, hinting on the conditions that the game must be in for the UFO to spawn but I don't understand the lines. And the reason that there is a straight line from Franklin to the UFO is that he is the one who will be choosing the game's ending and is the trigger to the end of the story. Also, looking into the game files, "Come back when the story is complete" text thing is also in the same texture as the mural which confirms this even further. a red eye is also below the binoculars on top of Mt.Chiliad which is also a reference to the red eye (UFO) on top of the mural, it's a hint for players to stand at what location in order to see the UFO.
The conclusion is that this mural is a reference to story mode and a guide on how to unlock the chiliad UFO, nothing more. There is another reason behind the altruist camp jetpack sign and it has nothing to do with this mural. I'll close this mural's case for now.