Uchiha Obito was merely a vessel for those Rinnegan, whether he was with Madara Uchiha or Uchiha Kyu.
Uchiha Kyu did not crave the Rinnegan's power that much.
The Sharingan and Rinnegan did not belong to the same power system and could not be fused.
Using the Sharingan's power meant being unable to use the Rinnegan's power. This could be seen when Madara Uchiha fought the Five Kage in the original story: only by switching from the Sharingan to the Rinnegan could he use the Rinnegan's abilities.
The Mangekyō Sharingan had never been weaker than the Rinnegan. On the contrary, the Mangekyō Sharingan possessed a diversity of abilities that the Rinnegan could not match.
Between the two, it was essentially an even match.
Even if one seized power that did not belong to oneself, it could not be completely controlled.
Madara Uchiha's Rinnegan had formed after he absorbed Hashirama's cells, allowing chakra of Yin and Yang attributes to merge and produce Yin-Yang Power.
The power born from the union of Yin and Yang could transform into Myriad Phenomena.
The information Madara Uchiha had obtained from the stone tablet back then had been deliberately altered by Black Zetsu and specifically left behind for the Uchiha Clan's descendants to see.
There were only two reasons for launching this multi-front lightning war.
First, to clear out a safe and stable rear area and lay the foundation for the Uchiha Clan to dominate the Shinobi World in the future. Even though the Land of Wind had an extreme geographical environment, he could still turn waste into treasure.
Second, Uzumaki Nagato, that pawn, was beyond saving. Only an extremist like Uchiha Obito could truly bring out the Rinnegan's real potential and allow Black Zetsu to revive Madara Uchiha.
Heh heh...
Everything in the future was