Uchida, who became CEO in December 2019, a year after Ghosn's arrest, said he felt "ashamed and miserable" upon hearing of Ghosn's arrest from news reports.
"I simply cannot believe the nerve of partaking in such misconduct," he said.
Prosecutors allege Ghosn, 67, and Kelly, 64, hid some $85 million in postponed compensation from 2010 to 2018. Both men, arrested the same day in 2018, deny any wrongdoing. Whereas Ghosn jumped bail and escaped to Lebanon in late 2019, Kelly remains in Japan to stand trial.
Uchida's statements wrapped up the last day of testimony in Kelly's proceedings, which began on Sept. 15, 2020, Kelly's 64th birthday. Kelly now enters another long wait. Prosecutors make their closing argument on Sept. 29, and the defense makes its final appeal on Oct. 27.
A verdict could take as long as early next year.
Uchida's stinging rebuke of the Ghosn era stood in marked contrast to the testimony of Ghosn's immediate successor, Hiroto Saikawa. Saikawa, the CEO at the helm when Ghosn was arrested, testified this year that Ghosn was a "brilliant" business leader that Nissan couldn't afford to lose.
But Uchida insisted that Ghosn had overstayed his welcome at Nissan, after saving the company from near bankruptcy in 1999 and leading it for nearly two decades until his arrest and downfall.
"Mr. Ghosn served as CEO for too long a period," Uchida said.
Uchida said Ghosn's long tenure allowed him to consolidate too much power in himself and that the resulting culture of submission precluded open discussion and even serious talk of succession.
"The company gradually became a place where workers just wanted to please the boss. That absolute power applied to compensation and personnel matters," Uchida said. "People would wonder what would happen to them and their career if you mentioned succession."