This is interesting. I'm curious as to why the Rising Sun Facility was "lost." A few things come to mind. One is that the less frequent supply drops somehow spelled doom for the facility, or that this mysterious plane and bright light is the cause. One that I enjoy thinking about, though, is Zombies. Who knows what "the final results" were (I'm sure it could be figured out, but that's for another post), but it involved Element 115 and seems to have taken place at Shi No Numa. I don't know if that means the zombies that Division 9 created (if they did, that is) took over the site but the Emperor was impressed by them? I don't think it is, but I at least want to lay out everything going through my head.
As for Takeo, it's really interesting. For some reason he is heralded as a hero by their society, which I assume has to do with his family's very honorable history (see: SNN bios) and his war victories. As for why this would lead to the Emperor being questioned I'm unsure, but I'd chalk it up to general paranoia and not wanting anyone else to be the center of attention. Perhaps his family has a history of causing trouble or something, but at this point it's too much speculation for me to go further haha. I'll look into it a little more and see what I can find :)