Uh what? He has always been righteous. In ARR his righteous were obscured a bit by his naiveté so he came across a bit as a snot, but the dude has always been a walking embodiment of righteousness. Probably the most out of all the scions. Always was, always has been. His idea never changed, even before he set foot on Eozea. In fact, we ARE realizing his vision for Eozea from his original thesis that he wrote when Loiusoux was still alive.