This chapter has further established that the Gedō Mazō sealing statue can only be summoned and used by those who possess the DNA of the Uchiha and Senju Clan. It has also been noted that it took Madara like, five decades just to unlock the Rinnegan, and the moment he unlocked the Rinnegan was at the moment he was about to die.
I think it's good that only those who possess the DNA of the Uchiha and Senju clan can claim the Rinnegan as everyone on Shinobi Legends waddles around and claims the Rinnegan. To be quite frank; Rinnegan, like the Flying Thunder God Technique, should remain unique and not be unlocked just because you've gained the Eternal Mangekyō Sharingan. It is said to be used many decades ago back in the days when the Sage of the Six Paths was still alive and now in the present days; The Rinnegan, in general, like Chiyo's "One's Own Life Reincarnation" technique is almost lost forever.