He might be able to regenerate and heal/make people younger. Everytime Madara loses a body part it's replaced in some Zetsu hideout or something. So maybe Black Zetsu does the healing or other strong techniques, he can also record what he sees, i would assume and maybe even use his eye to look great distances, I guess he also has the ability to keep his cloning ability going until he releases it. but other than that we don't know.