I just remembered something.....i can't believe i forgot......when obito punched through madaras chest and extracted a small portion of the 1 and 8 tails didn't madara mention something about obito also taking the sage mode that madara stole from hashirama,what if......maybe obito gives sakura the sage chakra ......cause you know something funny when hashirama goes sage mode that symbol on his forehead looks like the symbol on sakuras back,maybe there's a lil hint there that somehow.....one way or another sakura might aquire that sagemode not only that but if there's even a lil chance i could be right also what if not only that but obito gives her either both his magekyo and rinnegan or just 1 or the other afterall sakura has been noted by kakashi to have perfect chakra control not only that but that she would make a great genjutsu user,so....with this in mind maybe if obito is gonna give sakura 1 of his dojutsu maybe it would be the mangekyo then sakura could use it to do genjutsu etc also if obito gave sakura the mangekyo and told her to warp back to the battlefield guess what that would mean.......Madara wouldn't be able to get his other rinnegan cause obito would be stuck in kamui land and the only one who would be able to enter kamui land would be sakura and kakashi and i doubt that they would warp mardara to kamui land plus madara wouldn't be able to do anything about it cause his hands would be full so in the end madara's plan to get his other rinnegan in order to use rinnegan's full power would have failed.