Board Thread:Episode Discussions/@comment-1018594-20150402131426/@comment-4912646-20150402222431

Red hair could be possible too, since the Ten-Tails' jinchūriki has always been stated to obtain Hagoromo's power rather than Kaguya's, complete with his magatama pattern and Six Paths Senjutsu. Which admittedly has never made any sense to me, as not only did he not create the Ten-Tails, he apparently never even had its body sealed inside of him. It also appears that Obito and Madara's hair may have turned white for different reasons, as Obito's changed before absorbing Ten-Tails and was permanent (like Nagato's) whereas Madara's only changed temporarily.