Board Thread:Theories and Speculation/@comment-36512555-20200302063012/@comment-24824859-20200310163742

Squinty97 wrote: Juubito had the same DNA essentially as Madara, since Madara at that point had no transmigrant chakra and both had Uchiha/Senju cells. So it's not just lineage, it's something else. And what's a limiter we've already seen on various containers? Chakra. Madara still had Indra's chakra after his second death. Hence, how Kabuto was able to reawaken his Rinnegan by implanting more of Hashi's DNA into his corpse. This was further proven when Hagoromo materialized right after Hashi transferred some of his chakra into TTJ-Madara's lower half; Hagoromo attributed to his materialization to the combination of Indra's, Asura's, and Kurama's chakra.

Though lineage plays a role in being a TTJ, I thought it was mostly attributed to will power.