Rationalizing the current chapter:

[Curteth]

Obito was thee reincarnation of the Sage's brother... It would explain why Kakashi was able too "copy" thee un-copyable...

That, and or...

Let's jus' all agree it was a "manga filler". We know Kiashi works along side his family; who's to say he wasn't pressured by them/drunk that day on saki...

Doubt anyone has a better explanation than this one!

 

[A$AP Wap]

I don't think Obito's role will be that important anymore.
But I do want the Sage to tell us more about his brother.[SUB]

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[/SUB]​

 

[NukaCola]

Obito gave him the special chakra needed to awake the sharingan.