That's not all my friend.
Tobi was the one who transplanted Itachi's eyes into Sasuke. What if... he "transplanted" something else too. Sasudara
Sakura was giving Obito a lot of her chakra to keep the portal open for Sasuke. What if something traveled back through her chakra into her body? Sakudara
Same thing with Naruto. He tried to save Obito who was hit with the bone. In that final moment, something could have entered Naruto's body. Narudara
And there's more!
Madara was the one who launched Infinite Tsukuyomi. What if he also sent his chakra throughout the tree, infecting everyone else caught in it.
Shikadara, Inodara, Tsunadara, Gaadara, Beedara, Konohadara, Hinadara, Kibadara, Shinodara, everyone! The whole world!
Everyone is a Dara!
The conflict in the upcoming movie, The Last, isn't against Orochimaru, or Spiral Zetsu, or Kaguya returning. It's the fight against the Dara Infection