Regarding the obvious signs of a Griffith-like metamorphosis, Slan’s words —
But sarcasm aside, if that child’s existence is strength, then it is strength that limits him. If that child’s anguish carries on, how long can he last? His new existence shall become unquenchable despair. (Vol. 13, Ch. 82, p. 53)
— make sense.
That means he simply has to become weak to overcome his limits.