The Nine-Tails did not open up his full memories.
Konoha's voice transmission line could send in only three questions that had already been put in writing.
The first question concerned the spatial arrival point Obito had used when he entered the sealing site.
The Land of Rivers removed the specific positions from the Twelve Rings, leaving only the directions of the folds.
After examining them, the Nine-Tails rejected two.
"I can't see the patterns on the moon."
"But when that man appeared, space first collapsed inward once from the right."
The record Obito had submitted said from left to right.
No one in the Observation Zone corrected it for him.
Obito closed his right eye and recalled which way he had been facing at the time.
He had mistaken his own perspective for the seal's perspective.
The path itself was not wrong, but the recorded direction needed to be reversed.
That error was preserved exactly as it was.
If the Nine-Tails had merely been cooperating with Obito to clear his name, the simplest approach would have been to confirm everything.
By pointing out the discrepancy, he instead allowed the two testimonies to form a genuine cross-check for the first time.
The second question was where the eye power that controlled the Nine-Tails had come from.
The transmission line offered only three choices.
A collective Uchiha technique.
A single Sharingan.
Indeterminate.
The Return Bell rang only once.
"One eye."
The Nine-Tails did not describe the inside of the seal, nor did he reveal everything he had felt while under control.
He confirmed only that the eye power had entered from a single point behind the mask.
There had been no clan meeting imprint.
No Konoha Military Police Force chakra.
Nor had there been a Sharingan array maintained by multiple people.
Obito