After the limited passage opened, no one immediately let Obito through.
The three parties first verified the path.
Kakashi maintained the outer fold.
The Land of Rain confirmed that the fourth authority had gone dark.
The Land of Rivers checked the Twelve Rings on the Lunar Surface. No new reversals had appeared.
The passage remained open only when all three conditions held.
Obito also had to undergo an inspection before entering.
He could not bring any stones from the Kamui layer.
He could not bring any black chakra.
The original path would be transmitted back only as separate records, without entering his body.
If any overlay sharing Kaguya's or Black Zetsu's origin was detected, each of the three parties in the physical world would close its own section.
Obito also had to reduce his right eye's eye power to the minimum first.
They were not taking away his Sharingan.
They were preventing him from instinctively opening a new Kamui destination as he crossed the passage.
The sealing would last only until his body had fully entered the Observation Zone.
Any continued restriction on his eye power afterward would require a separate justification.
Obito did not ask them to ease the conditions.
"Open it."
The passage widened from a thin line to an opening that could accommodate only half his body.
His right arm passed through first.
The White Zetsu tissue had already undergone extensive necrosis.
There was no black core, nor any pale markings from the Lunar Surface.
The medical ninja examined only the surface, without using his wounds to read his memories.
Once they confirmed that nothing was attached, the passage widened further.
Obito stepped back into the physical world.
The exit stood in the open ground outside the Land of Rivers' soil-free observation room.
Neither Konoha, the Land