Pardon me for posting this here, but come to think of it...
The Full Moon boy, the boy who helped Guts in a pinch especially when his mind was stuck inside the Berserker armor not once, not even just twice, but thrice, was Griffith all along.
The question is: Why? Why would Griffith, of all people, help Guts in a way that not even Skull Knight and Schierke could? Does he not want to allow Guts to die just so Guts can live the rest of his life miserably? Does he actually want to transcend higher than just being one of the godhands, and he somehow needed Guts (and Casca) to stay alive for it? Does he actually and genuinely believe he could convince Guts (and Casca) to live in the kingdom of his dream, Falconia?
He has all the chances in the world to just kill Guts, and definitely has more than enough power to do so. He could have also killed Rickert who not only refused to live in Falconia, but also slapped him in front of his men and fianceé. Both Guts and Rickert are potential threats who could someday expose Griffith's huge dark secret, and killing them would effectively extinguish such threats, yet he never did. Again, Why?
Something tells me that as much of a petty, despicable asshole as Griffith is, he wouldn't kill them, and would even help them instead, just because they are former members of the Band of the Hawk.