Hiroto Saikawa had been tipped to get to the top
Hiroto Saikawa had been tipped to get to the top AFP / Behrouz MEHRI

Hiroto Saikawa, who will step down as Nissan CEO next week, was long considered one of "Ghosn's children", a loyalist to the powerful tycoon who owed him everything -- but then oversaw his downfall.

In the end, the mild-mannered 65-year-old bespectacled Nissan lifer could not escape the maelstrom at Nissan caused by Ghosn's ouster and is stepping down following allegations of impropriety over his own pay.

Saikawa was forced to apologise amid reports he improperly added 47 million yen ($440,000) to his salary by altering the terms of a bonus. He denied any wrongdoing, saying he had left that issue to someone else.

Ironically, it was an audit Saikawa set up himself to improve governance in the wake of the Ghosn scandal that revealed the alleged irregularities that led to his own fall.

Saikawa spent much of his career in Ghosn's larger-than-life shadow and surprised many with a passionate attack on his former mentor at an emotional news conference following the out-of-the-blue arrest.

Lashing out at the "dark side" of the Ghosn era, Saikawa appeared to be affected personally by the alleged corruption of a man who had overseen his career.

"It's way beyond being sorry. I feel, I don't know, big disappointment and frustration and despair. Indignation and resentment," said Saikawa.

A year older than Ghosn, Saikawa joined Nissan in 1977 directly from the prestigious University of Tokyo where he studied economics.

He took several brief postings in Europe but his big break came in 2000 when Ghosn officially took the helm of Nissan and embarked on his aggressive campaign to turn the company around.

Under Ghosn's wing, Saikawa rose steadily through the ranks as a procurement specialist, impressing other executives with his zeal to drive down parts and material costs.

'The time is right'

Saikawa's career developed quickly as he held various senior positions, ranging from head of the management committee in the Americas and Europe to executive vice-president of purchasing.

As a key member of the auto alliance that combines Nissan, Renault and Mitsubishi Motors, Saikawa also sat on the French firm's board of directors between 2006 and 2016.

In this role, he won praise from Ghosn for his dealings with French officials as he defended Nissan's autonomy from Renault, which holds a 43-percent stake in the Japanese brand.

A private man, little is known about his personal life, with Nissan insiders describing him as a serious businessman with an eye for detail.

"His way of thinking is more business-oriented than French people," the head of a parts maker told industry website Newswitch in 2016, in an apparent comparison to other Japanese business people who prize relationships over profits.

Outside Nissan, Saikawa has also served as chairman of the powerful industry body, the Japan Automobile Manufacturers Association (JAMA).

Ghosn finally appointed his right-hand man as co-CEO in 2016 and a year later stepped aside to leave Saikawa in sole charge.

At that time, the two heaped praise on each other, with Ghosn saying "the time is right" for Saikawa to step out from his shadow.

But at his news conference following Ghosn's arrest, Saikawa vowed the company would learn from the mistake of placing too much power in the hands of one executive.

"Ghosn-dependent Nissan makes a clean break," said a headline in the Asahi Shimbun after Saikawa's comments.

Calls nonetheless mounted for Saikawa's own head, but he brushed them off for months, saying he wanted to launch a fresh start for the firm and would discuss the timing of his stepping down "at the appropriate time."

Nearly one year on from the arrest that turned the company upside down, Saikawa is now leaving the stage under a similar cloud to the man to whom he owes his career.