the difference between IGA and Inafune is IGA left on good terms with Konami. He made them some good money, then decided to go on to other things. there was no bitterness. Meanwhile, Inafune didnt leave, he was forced to quit in that very japanese way of firing people. he had burned them too many times to get his way, (like going overbudget on prototypes to force the suits to greenlight it to recoup losses) and then badmouthed the entire japanese industry in that interview.