ok i will say it to you guruguru is a result of WZ so when he enveloped yamato (who is useless for real) he gave him an advantage of power (cz he is more powerful than him like obito's case ) but in the case of madara:
1-he don't have sage power anymore , he lost sage power cz no more bijuu
2-he for sure still have sharingan cz it's a result of chakra emitting in the brain so he have it
3- he might still have hashirama's cells (not sure about it )
4- i think at least madara should have learned something from all that i don't think he could have third eye power anymore though it was kaguya's power (who was sealed ) and he got 3rd eye cz he got closer to kaguya and bigin fusing with her and now the seal is in his strongest situation so it will be nearly impossible to break it again in that time
5- sasuke don't have rinnegan anymore and naruto don't have those powers anymore anyway naruto still have asura's power and if he became jinchuriki of all again he will regain his powers and for sasuke his indra power are inside him to so any contact with indra's cells will reawaken his rinnegan so they two could regain their full power
6- out of topic but i don't think any of aliens ideas gonna to happen cz who give those ideas are getting it only from the story of kaguya in japan so no for aliens sorry .
i hope it was clear and if you need anything i can help maybe i am not a senior or admin member but i still a man who have knowledge in naruto and it's philosophy so i can help you , wish you give your opinion if you have anything to say i am ready to accept any ideas and think about it and search and give you my response .