"You mean, you suspect Madara held something back and didn't leave you the entire Uchiha Inheritance?"
"Youhu inherited what remained of Uchiha Madara's legacy, so his combat strength skyrocketed. He was suddenly able to defeat Elite Jonin Kakuzu."
After learning Obito's thoughts, Black Zetsu felt at a loss for words. He asked, "Do you really think Uchiha Madara held something back?"
"Didn't you leave yourselves a backup plan?"
Obito answered Black Zetsu's question with another question. He remembered clearly that a Curse Mark had been planted over his heart, leaving his life and death in Uchiha Madara's hands.
He agreed with Uchiha Madara's Moon Eye Plan, but that didn't mean he agreed with Uchiha Madara himself.
Seeing that Obito wasn't willing to believe him, Black Zetsu had no choice but to explain earnestly, "The Uchiha Inheritance Youhu obtained definitely had nothing to do with Madara. It may have been left behind by another Uchiha."
"Lord Madara had you. He had no need to train any other Uchiha."
Black Zetsu was telling the truth.
After the Battle of the Valley of the End, Black Zetsu had infiltrated Madara's side. He could be certain Madara hadn't left behind another legacy, but as for whether Uchiha from other eras had left behind any...
Black Zetsu didn't know.
"Let's hope so..."
Obito was doubtful, but he more or less accepted Black Zetsu's explanation and didn't give the matter much thought.
First, Youhu hadn't mastered Wood Style. The Thorn Insertion Technique just now had been unleashed using White Zetsu.
Second, Youhu hadn't awakened the Mangekyo Sharingan. No matter how powerful his Three-Tomoe was, it still had its limits.
Without implanted White Zetsu Cells or the Mangekyo, no matter how strong Youhu was, he was no match for Obito. Obito could handle an Uchiha like him