Sensing that his control over Minato Namikaze was rapidly weakening, Orochimaru decisively took control of him by force and brought him over with Uchiha Obito. Then he quickly pried the Rinnegan implanted in Uchiha Obito's forehead free and transplanted it into the palm of his hand.
After finishing, he promptly leaped backward, dodging the Light Sword Minato Namikaze swung at him. At the same time, he bit his finger and formed hand seals.
"Summoning Technique!"
As a huge cloud of smoke burst into the air, the massive body of the Dark Ten-Tails appeared. Orochimaru went straight inside it and used the power of the Rinnegan to suppress it, while having the small Dark Ten-Tails he had cultivated inside his body devour it.
The two were of the same nature, and with a pair of Rinnegan suppressing it, the Dark Ten-Tails' consciousness was subdued, leaving it unable to do anything but be devoured by the small Dark Ten-Tails.
Orochimaru had cultivated the small Dark Ten-Tails himself, and after years of growing in sync, they had long since become perfectly attuned, allowing him to control it even better.
"Golden Wheel Reincarnation Explosion!"
"Susanoo Blade!"
Hyuga Hiashi's attack and the attacks of Uzumaki Naruto and Uchiha Sasuke arrived at once, all striking the Dark Ten-Tails and nearly cleaving its body in two.
This dealt a grievous blow to the Dark Ten-Tails, but it instead helped Orochimaru, allowing him to devour and refine it faster. It also let Orochimaru quickly become a complete Ten-Tails Jinchuriki, stronger than Shimura Danzō and Uchiha Obito had been.
His foundation was far deeper than Shimura Danzō's and Uchiha Obito's. Not only had he carefully cultivated the small Dark Ten-Tails, he had also extracted the power within Uchiha Sasuke and Uzumaki Naruto, making his Six Paths bloodline more complete.