He didn't cut ties with Sasori, he died. And after that, he then too died in Sasuke's arms. So when was this time he did it by himself you were talikng abaout?Which were cut off in part one and two. He does most of it himself.
Only Zetsu and probably Obito knows where Madara's body is hidden. They wouldn't just dump somewhere Madara's body where anyone could find it. Also Zetsu keeps the Akatsuki's bodies.
Ayyyyyyyy lmao