HShigoto comments

According to UN human rights documents

[ "torture" means any act by which severe pain or suffering, whether physical or mental, is intentionally inflicted on a person for such purposes as obtaining from him or a third person information or a confession, punishing him for an act he or a third person has committed or is suspected of having committed, or intimidating or coercing him or a third person, or for any reason based on discrimination of any kind, when such pain or suffering is inflicted by or at the instigation of or with the consent or acquiescence of a public official or other person acting in an official capacity. It does not include pain or suffering arising only from, inherent in or incidental to lawful sanctions.]

If you ask anybody   who has consulted   the worldwide journals and magazines  (from all nationalities)  about the custody detentions conditions of Ghosn:

Did and does the Japanese justice practice the mental torture on Ghosn ?

The high rate of returned answer is: YES

Does the Japanese justice practices in divergence with UN human rights texts the rate of answer occurrences is: YES

Several Nissan leaders should in theory be convoked by the presecutors. However, it may not happen, if they  have already negotiated some  kind of national "contract" between the Japanese justice and Saikawa (in the new japanese laws the negotiation of sentences is feasible). This may allow Saikawa to do not be condmaned and he may to have already obtained some assurance about the possible evolutions of judiciary process. Of course, viewed from many justice systems of many countries such mechanisms can be understood in the case of Mafia or terrorism groups. If there will no custody of Saikawa, Japan justice system would appear as abnormal from various standpoints.

If it appears to be true that "Carlos Ghosn was planning to replace the Nissan CEO before his arrest" (*), therefore Saikawa's role in this "Shakespearean" drama is undoubtedly a major one.

If Saikawa was really interested by the global interest of the automotive group and not his own interest, he could have been proactive since the first day he was CEO of Nissan.

Feeling threatened in his position, he immediately fired point blank  Ghosn and Kelly. His real objective was purely individual (not the interest of the group Nissan-Mistbushi-Renault).

Anyway, the near future would equally show how the Japanese detention system has play an involuntary role in the degradation of various images of (Nissan, Mistbushi, Renault, and Japan. Saikawa's fear for his position +Japanese detention system have created "an earthquate" deteriorating a successfully working international partnership which WAS envied by many competitors. (Hope I am wrong).

(*) (https://www.wsj.com/articles/carlos-ghosn-planned-to-replace-nissan-ceo-before-his-arrest-1544348502)

The concerned prosecutors will search all possible ways to formulate new accusations. They will do everything they can to prevent Ghosn be released, they are really afraid about their image already affected by their practice of mental torture. Fortunatly, in ournowadays  communicating world, huge number of fair people eyes are well open and many papers express sharp critics about the used abnormal practices (even if the place of such practices is Japan: widely respected as a very civilized country)

Seen (at least) from outside Japan, this is a small scandal that contrasts with a great scandal of judicial practices of obvious psychological torture to obtain confessions from detainees: seemly people who applying historical judiciary practices of custody don't care about great negative impact on the International image of Japan.