No, Juubi = 9 bijuu
Madara wasn't immortal until he absorbed the tree
The Ten-Tails was original the Holy Tree and Kaguya (Tailed Beasts), but Obito had separated the Holy Tree from himself and the Ten-Tails, which is why Madara absorbed the Ten-Tails and then later absorbs the Holy Tree, making him immortal.
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Being Kurama's jin is an immediate loss for Sasuke.![]()
10 tails = part of Kaguya
Kaguya = 10 tails + Shinju
Shinju requires the chakra of the entire world, without that JJ Madara isn't immortal, he admitted Gai nearly killed him and ran away from Naruto's RS knowing it was potentially fatal