True, it may have been the sun, but wouldn't he have looked better in red and silver armor rather than red and gold? That coloring scheme has just bugged me since I saw the first photo.
It seems to me that the Enigmatic Soldier's armor colors are different from the first secret ending. If you look closely, the gold is originally silver and the red is about the same. Then again, it could just be the sunset in the background. Also, I wonder why Nomura changed the villain's stance from the first ending as well. It's obvious that the first time the villain wasn't an elderly mage with his hands behind his back, but a much younger warrior, possibly the Dark Soldier, was the being walking towards them. I don't know, just observations and thoughts of mine.