Board Thread:Theories & Speculation/@comment-1512913-20141028151348/@comment-945885-20141101000119

That's the thing though, isn't it? Obito, Madara, and Naruto gained the Truthseeker Orbs passively, as an extension of their transformations. Naruto isn't kekkei anything, but he was able to use advanced transformations thanks to the tailed beasts, and we don't know if the orbs fall under that category. That was always the question, and that entry alone doesn't clarify it.

There's also the fact that Obito's were identified as having at least 4 natures, which either means it's at least a kekkei tota but it doesn't mean the character has the bloodline power itself, or that Obito's, Naruto's, and Kaguya's are all different.