Thinking of Kabuto's sudden departure, Orochimaru's unusual disappearance during this period, and Orochimaru's current predicament of residing within Kabuto's body, Hyuga Kagami quickly formed all sorts of conjectures.
Orochimaru had set his sights on Danzo's body when Danzo held the "Bloodline Fusion Ritual," or perhaps even earlier.
This could be seen from Orochimaru secretly planting a "Curse Mark" inside Danzo, intending to use the natural energy contained within it to erode Danzo's spirit body.
Orochimaru had clearly underestimated the power of the "Bloodline Fusion Ritual" that he and Hyuga Kagami had designed together.
The "Curse Mark" he had secretly implanted in Danzo not only failed to help him seize Danzo's body, but instead allowed Danzo to use the natural energy within it to suppress the spirit bodies of the five bloodline ninjas absorbed during the "Bloodline Fusion Ritual," allowing Danzo to initially achieve the fusion of seven chakra natures: yin, yang, and the five elements!
In the ninja world, chakra nature fusion was the key to a leap in strength.
As long as one could fully fuse chakra of different attributes, any miracle could be created. With the power of the "Bloodline Fusion Ritual," Danzo had transformed his aged body into a nearly immortal perfect ninja. Not only did he possess seven Kekkei Genkai, but his eyes, infused with a great amount of the Power of All Creation, had evolved into a pair of Eternal Mangekyou Sharingan.
If Hyuga Kagami had not interfered, Danzo, who had been determined to sacrifice the fifteen hundred Konoha ninja outside the cave to continue the ritual, might have directly obtained a pair of Rinnegan during the ritual.
It could be said that after the ritual, Danzo had surpassed Shisui, Itachi, and Hyuga Kagami's Fire Clone Technique, becoming the perfect body Orochimaru desired most.
So