Under the Rinnegan's gaze, Uchiha Genmei discovered...
Jing and Yuta lacked the pure Yin Release Chakra that came with the Mangekyo.
After the Genetic Serum was injected,
a massive amount of all-purpose chakra appeared in their bodies and surged toward their eye sockets.
This chakra wasn't as aggressive as Hashirama Cells had been in the original story.
It was probably because of White Zetsu!
Don't be fooled by how its combat ability was hard to assess in the original story, aside from its usefulness in gathering intelligence.
But...
These creatures were the biological weapons Otsutsuki Kaguya had poured her heart and soul into creating.
As chelating agents, they were no ordinary things!
"No problems! The two of them are undergoing a transformation. It's hard to say whether they'll awaken the Mangekyo..." Uchiha Genmei explained the general situation to the subordinates around him.
"But their overall physical abilities will improve tremendously. I'm sure you can already feel the difference."
His words made everyone present pause in thought.
That was true!
Their transformation wasn't limited to their eyes. The changes to their bodies were even more astonishing!
Seeing them carefully take stock of the changes in their bodies,
Uchiha Genmei had finished restoring part of his genes... and obtained the 'Karma'.
He had come to fully understand one reality.
That was, the Otsutsuki's authority over chakra...
was absolute!
There was no doubt about it.
Never mind the Otsutsuki with their impressive stats.
Just consider Indra.
His three-tomoe Sharingan represented the peak of Yin Release.
He had no Mangekyo, yet could still summon a Susanoo hundreds of meters tall.
Why did the Uchiha of later generations have to break the balance of the 'three tomoe' to reach the peak of Yin Release?
It was simple...
The Second, Senju Tobirama, had already explained it