for your kind information they are alive beings. If a black zetsu can do ninjutsu and also contain half of 9 tail chakra with ease then He can also use Rikudo jutsu with the rinnegan.
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Black Zetsu has all the knowledge about Rinnegan and jubi so he can also perform the Rikudo jutsu and be a Jubi host when possible.
for your kind information they are alive beings. If a black zetsu can do ninjutsu and also contain half of 9 tail chakra with ease then He can also use Rikudo jutsu with the rinnegan.
+
Black Zetsu has all the knowledge about Rinnegan and jubi so he can also perform the Rikudo jutsu and be a Jubi host when possible.