That's a good point about the True Water and True Lightning Runes possibly coming from Harmonia. If they did originate there, I wonder why Harmonia collected all of the elemental True Runes.
Also, everyone knows there are 27 True Runes, but do the people of Suikoden know the names of all the Runes, is it common knowledge? Should the leaders of Harmonia, at least know?
Life & Death (Soul-Eater), Beginning (Bright Shield/Black Sword), Change, Circle, Dragon, Blue Moon, Gate (Front/Back), Eightfold, True Fire, True Water, True Lightning, True Earth, True Wind, Sun, Night, Punishment = 16 known True Runes (if I'm right).
Suikoden VI is the last entry in the series? Are they going to reveal the last 11 True Runes in one title? If they do, it must involve Harmonia since they are stocking up on True Runes; what other sensible way is there to reveal them all?
Also, Sasarai was unaware of Luc's identity (since he wore a mask) and did not know of their identical appearances. So if they are clones of Hikusaak, Sasarai must not know what Hikusaak looks like; I thought he would be in the loop of their leader's 'missing status'. Also, there must be no other clones working in a public capacity (as Bishops, for instance) or Sasarai would see people identical to him. And if Hikusaak is missing and powerful Bishops like Sasarai are unaware of clones, then who is making clones and raising them, who is keeping the True Runes under guard and then implanting them in clones. Unless it is Hikusaak, the keeper of the True Runes is either a deeply loyal fanatic of Hikusaak and Harmonia, or has a True Rune herself/himself; otherwise, they would be deeply tempted to take one of these True Runes for themselves (imagine being the person that guards Harmonia's True Runes, that are in a secret location unknown to most, and not making one of them your own). I would not be surprised if there was another clone that disposed of Hikusaak, took the Circle Rune or a more fitting Rune, and manages the cloning process herself/himself. It could be the number 2 position in Harmonia, unavailable to even many of the Bishops or could take measures to guard his identity, like Luc. (The Harmonians seem willing to entrust great political power to masked figures).