Sai states in the manga that if Shuusaku existed for his sake the he himself existed for Hikaru's, to pull out his Go potential.
Now if the cycle continues there is only one logical conclusion, Akira is the chosen one. A child without equal, no one his age can even compete with him. Given enough time he is likely to burn out. However during his childhood when his love for Go is still pure he is defeated by a child his own age. Hikaru exists to push Akira towards true Go perfection.
Touya Akira will play the "Hand of God"
Sai states in the manga that if Shuusaku existed for his sake the he himself existed for Hikaru's, to pull out his Go potential.
Now if the cycle continues there is only one logical conclusion, Akira is the chosen one. A child without equal, no one his age can even compete with him. Given enough time he is likely to burn out. However during his childhood when his love for Go is still pure he is defeated by a child his own age. Hikaru exists to push Akira towards true Go perfection.
Edited by Wangyuanji