Your absolutely right. Management was always a serious problem for SEGA. Take the case of SEGA of America CEO Tom Kalinske. With Kalinske at the helm SEGA grew from a $813 million dollar company in 1989 to a $3.6 billion dollar conglomerate in 1993. Additionally, with all of Kalinske’s suggestions implemented SEGA had 55% of the market locked up by 1992 up from a pathetic 8% prior to Tom. A major reason if not the number one reason for SEGA's downfall was when Tom Kalinske was forced out by a series of horrible business decisions by Sega of Japan. Kalinske's departure/resignation kicked off a domino effect from which SEGA was never able to recover from. SEGA of Japan should have accommodated Tom and made him happy in turn he would have continued to do what he did best: making SEGA allot of money.
http://www.wired.com/2014/05/console-wars-book-sega/
http://www.sega-16.com/2005/02/tom-k...rican-samurai/