What is stopping him of flying? Ōnoki and the kage b4 him was able to fly? Also I don't think flying is just a Rinnegan Tech because 6 Path of Pein wasn't able to achieve flight. So maybe its the ability of having the senjitsu of the Sage. Also will explain why Ōnoki could fly cause of the combination of his chakra natures. Maybe not during this fight with Madara, but i believe one day he will have the ability to fly around.
Any agree I don't think it to far stretch.
Any agree I don't think it to far stretch.