I can tell you why he killed the Saturn. Hubris. He didn't want to be involved with a "losing" platform, even though the replacement was not close to ready. so he just killed it and as a direct result, drowned SEGA of America in a river of red that would put Moses himself to shame. By the time the Dreamcast hit, they were in such bad financial and organizational shape with terrible retailer relations to boot that the DC was functionally DoA - they didn't have the economic engine to push past the resistance to get to the success it deserved.