So, just what is the purpose of those nasty Sharingans on Danzo's arm? (poll 2436192)

So, just what is the purpose of those nasty Sharingans on Danzo's arm?

To add abilities to his chakra network and extend his lifespan

To give him multiple Sharingan abilities (i.e. Shisui's mind manipulation tech)

To aid in the ability to avoid techniques with more Sharingans meaning more intensity in this ability

One eye was bad enough. I have no idea...

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