Nagato did not let the Konoha Personnel enter the Land of Rain.
Nor did he speak directly with Konoha through Obito's space.
He only allowed Konan to extract the testing procedures from the summary, without adopting any of its conclusions.
The first test was paper layering.
Konan had three peripheral recorders who did not know the contents of the orders carry out separate procedures.
The first tested only the paper fibers.
The second tested only the direction from which chakra had entered.
The third numbered the results without touching the originals.
Only after all three groups had finished did Nagato combine their findings.
If the operators believed beforehand that Black Zetsu had tampered with the orders, they might unwittingly conduct the tests in a way that supported the expected answer.
Separating the procedures could not eliminate every bias, but it made it difficult for any one person to manufacture a complete conclusion alone.
The two conflicting orders were placed under identical humidity conditions to observe the sequence in which chakra and ink had entered the fibers.
The Masked Man's spatial countersignature had formed first.
The black lettering had followed at least seven and a half minutes later.
It was not a joint approval written at the same time as the underlying order.
The second test was a same-source reaction.
The Akatsuki did not have the Black Sample sealed away by Konoha.
Konan retrieved a speck of black membrane residue from a crack in the Drainage Tower's wall, then brought it close to each order in turn.
The residue did not react to the Masked Man's countersignature.
But when it touched the surface words "continue assembling," it automatically crawled along the strokes.
The third test was observation through ocular power.
Nagato performed this test himself.
The Rinnegan could not read the