1. Tsunade still have some chakra, you could see the marks at her head.
2. The real Naruto was under killerbee.
3. At the end of chapter, you see the old man. It is weird, when edo tensei version is more younger. But old man says something that sounds as if they are at another dimension. So I thought about a dimension that is beyond life and death. Which made me believe that Old man is The rikudo sage. You know rikudo sage want peace, and that's why obito and madara is doing prosject in order to meet Naruto who will stop them and bring PEACE!