I don't know if this has been brought up, but I think it's very possible that Minato might be released from Edo-Tensei in the next Chapter. So far we know that Edo's can be released upon emotional closure, like in the case with Sai's brother. The end of 644 showed Minato having an emotional moment; he has closure that Naruto heard his last words from his mother and him. Highly likely I imagine that Naruto will get other half next chapter. Discuss please 