This would make the manga even worse, a black creature which no one even thought about taking the spot of FV.
Said it before in my "final villains don't cry" thread. Will say it here too, Kaguya isn't the final villain. Black Zetsu maybe. Likely it's Sasuke or Madara. I don't know many long-time readers that really think Madara is done. It's way too obvious he used some sort of jutsu when he was landing and said "I'll do it".
The word "just now" in Japanese RAW was highlighted when he said "Naruto...
Just now, I saved this world". And he repeated "I am the Saviour." and that he had turned "hell into heaven". This is a suggestion about the creation of all things jutsu.
Madara realized in that moment what the Mugen Tsukuyomi wasn't what he thought it was and took immediate counter-measures against BZ/Kaguya. Do we really think a guy like Madara didn't detect Kaguya's chakra in the Shinju tree?