New arbitrary theory: Vaan, Rasler and Vayne are actually the Holy Trinity. Vayne is the Father (all-powerful), Rasler is the Son (martyred for his people), and Vaan is the Holy Spirit (proven by his ability to see the Occurias' illusory "ghost" of Rasler, which was only intended for Ashe).

This theory is based on virtually nothing and makes no real sense, but I stand by it absolutely