After Deidara returned to Iwagakure, the Third Tsuchikage did not lock him up at all, nor did he impose any substantive punishment on him.
He was simply too angry and gave him a severe beating.
And it was all just fists and kicks.
For a ninja of Deidara's level, a beating like that would not amount to anything.
After beating Deidara and venting his anger, the Third Tsuchikage immediately revoked his status as an S-rank rogue ninja and restored his file to the ranks of regular ninja.
Of course, the main reason was that Deidara had not harmed anyone in the village when he defected.
That was something the Third Tsuchikage found greatly comforting.
He still felt that Deidara was merely a child who had run away from home because he was angry that the Third Tsuchikage had been too strict with him.
In front of outsiders, he still defended Deidara, at most complaining about him a little himself.
He had not even said anything bad about Deidara to his own granddaughter.
In fact, Kurotsuchi was the partner the Third Tsuchikage had chosen for Deidara.
That was why he had not focused on training Kurotsuchi in combat skills.
He had not even taught her their family's Dust Release or certain special ninjutsu.
Most of Kurotsuchi's ninjutsu had been learned from her father, Kitsuchi.
Kitsuchi was also Kage-level.
But he was getting old, and his ninjutsu was too conventional.
If he truly encountered an opponent of the same level who was even slightly unusual, Kitsuchi could easily get into trouble.
That was also why he valued Deidara so highly.
Deidara's ninjutsu had enormous potential and tremendous destructive power.
Gaara's defeat at Deidara's hands was proof enough.
In the original story, if Sasuke's Lightning Release had not countered him, Sasuke might not