A little spinoff idea they could have done, let me know if you like it

[sharingansennin]

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Orochimaru's Hideout(one of many)

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Imagine if Orochimaru used the sound 5 to kidnap powerful ninja to make a curse mark army. A Hyuga, Akimichi, Inunza, Nara, Yamanaka, people from the rock, sand, mist, and cloud as well. While clearly you can see when Sasuke breaks Jugo out there are tons of fodder Curse Mark Ninja but if he used a better body he could of done well. This is clearly a small ark, not a series but it would have been interesting and we could have seen Orochimaru's greatness

 

[Lucidus]

curse mark army > zetsu army llol

imagine if he gave all the zetsu's the curse mark

 

[Trolling King]

curse mark army > zetsu army llol

imagine if he gave all the zetsu's the curse mark

And did the rinnengan thing obito did with the jinchuuriki paths