Good writeup, seems mostly accurate, although would you mind linking your sources if you still have them around?
One part I'm curious about is SEGA's current relationship with Atlus. The current hierarchy should look like this:
source
Implying that Atlus is under SEGA Games, however you state, and I've seen a source for this as well, that SEGA only lists Atlus as an affiliate, which could imply that they're not fully owned by SEGA. So I'm wondering just how much control SEGA actually have over Atlus. Their financial reports at least act as if Atlus is fully a part of the company.