For starters sasuke is a little gay arse biatch and won't recieve any bijuu neither rinengan. Now that's out the way its states in the latest chapter obito was able to pull abit of each of the bijuus chakra away from Madz. I get what your saying that its crazy how he can have abit of there chakra and there all talking like normal whislt the rest of there bodies are inside Madara. Maybe plot no justu or there using the plain to talk to Naruto and the sage