^^ This, here is your answer OP.
Now let mi list my own reasons why this thread is stupid and your rant doesn't make sense
1) Obito had only restored his control over his body WHEN BLACK ZETSU STOLE YIN KURAMA
2) YIN KURAMA FOOLED BZ and decided to help and restore Obito and help me restore control over his body(most likely he also contact him)
3) YIN KURAMA also most likely revealed to Obito which tailed beasts Obito need to stole and transfer to Naruto
4) Obito took piece of Shukaku and Gyuuki and trasfered them along with Yin Kurama to Naruto
5) In The lastest chapter Naruto appeared to save Gai which means Obito and Sakura are also out of Kamui's dimenssion(They have no reason to do that).
6) Main characterss and good characters are not idiot and wether Madara get his Rinnean back or no does not affect it, why ? since Obito took control BZ was incative as Obito didn't see any danger comming to real world as Naruto/Sasuke save him from Madara or he always can use Kamui to be itangible.
What will most likely happen: BZ has gathered all physical and mental strentgh to put into one attempt to deattach from Obito's body, when Obito had Kurama or tailed beasts chakra it could be problem but no it shouldn't be, especially if obito feel safe and he lower his guard down.
BZ will deattach from him taking Rinnegan with itself using oppening/discraction caused by arrival other good characters on good side-> BZ will travel underground to safely get into Madara's hands and merge with him. If Madara help him by enclosing himself into black sphere while launching TBB, it will give more then enough time for BZ to took action and merge with Madara.
Stop being butthurt OP, because I soloed your childlish arguments.
Conclusion: Kishi didn't kill BZ yet, because he has still reason to live. Besides did you forget how BZ trolled Minato with transfer of Kurama ?