Naruto: Impure World Reincarnation, Why Is There an Extra Coffin?

[Naruto+Invincible+Shuangwen+Living Dead] Blue Star veteran Li Chuangang was attacked and knocked unconscious during the supplementary episode. When he opened his eyes, he turned out to be the "accidental product" of Orochimaru's filthy reincarnation. When he was on the verge of death, he awakened the Blood Succession Limit "Step Body Refining" - with every step he took, his body's strength increased without an upper limit. Crushing rocks and breaking tree trunks was just the beginning. But the earth body needs chakra to sustain, so he has no one to rely on, and Orochimaru regards him as the "evolved body" that he must seize. He also has to hide his identity in Konoha to deal with the suspicion of patrolling ninjas and Gaara's murderous intention... When the fighting skills of veterans hit the ninja world, and when the secret of "walking to become stronger" was discovered by Naruto and Jiraiya, could he use his feet to find a way out and transform from a living dead in the filthy land into the "god of taijutsu" in the ninja world?