Death or Taxes, aka Don't Piss Off Umako Sengoku Daimyo's Chronicles of Japan

Fresh off the killing of Anahobe and the destruction of the Mononobe, Soga no Umako is riding high as a new sovereign, Prince Hasebe, takes the throne.  Surely things will have finally settled down, won't they have done?
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Rough Transcription:
Welcome to Sengoku Daimyo’s Chronicles of Japan. My name is Joshua and this is Episode 92: Death or Taxes, aka Don’t Piss Off Umako.
Before we get going, a quick recap: we are still in the late 6th century, and since the death of Nunakura Futodamashiki, aka Bidatsu Tennou, things have been a bit crazy.  The number of apparently legitimate heirs was rather impressive.  There were the various siblings of Nunakura, both full and half-siblings, and there were his children and his siblings’ children.  On top of that, there were some truly tense politics amongst some of the most powerful families in the realm, particularly the ancient Mononobe and the more recent Soga family, who had tied themselves so closely with the royal family through marriage that at this point just about every possible heir to the throne was in some way a Soga descendant.  The stories of this era have been filled with stories of death, war, and struggles for the throne.  Finally, there is the tension between Buddhism, which was first introduced in the early 6th century, and the established worship of the various kami, which also speaks to the tensions between various sources of spiritual political authority.
As we discussed int the last two episodes, when Nunakura passed away, Prince Anahobe tried to take the throne, and he was initially thwarted by Miwa no Kimi no Sakahe, aka Sakahe no Kimi.  Anahobe, possibly with the assistance of his brother, Prince Hasebe, as well as Mononobe no Ohomuraji no Moriya, killed Sakahe no Kimi, pissing off Nunakura’s former Queen, Kashikiya Hime.  Next, Nakatomi no Muraji no Katsumi, in support of Mononobe no Moriya, attempted to curse several of the candidates with stronger claims on the throne, and when that didn’t work, he just out and out killed Crown Prince Hikobito, getting offed himself in the process.  Throughout all of this, another prince, Tachibana no Toyohi, apparently ascended, briefly, but seems to have died of natural causes.  In the process, however, he provided legitimacy for his own children as Royal Princes and Princesses to also contest for the throne.
Moriya’s support of Anahobe led to the death of Prince Anahobe, Prince Yakabe, and Moriya and his family—and many of his supporters, as well.  And yet, despite the loss of the Mononobe and Prince Anahobe, the next heir to the throne, with the approval of Queen Kashikiya Hime, was none other than Prince Hatsusebe, aka Hasebe, a full brother to the rebel Prince Anahobe and the focus of this episode.  If this all seems a bit confusing regarding the individuals and different factions, then congratulations, you’ve been paying attention.  The narrative certainly seems to be missing some key information, likely lost in the attempt to either whitewash some of the more contentious historical records, or simply due to the Chroniclers’ attempts to create a more straightforward narrative out of a complex era which probably saw various courts competing to be recognized as the court that was actually making the decisions—something that doesn’t exactly fit in with the attempt to tell the story of a relatively unbroken royal line.
And yet, despite the chaos, we do see a solidification of power and control in general, as evidenced by the shift in late 6th century tomb structures.  As I may have mentioned in previous episodes, the Yamato area continued to build monumental round keyhole shaped tombs, but that shape of tomb simultaneously declined in nearby regions, which saw more round or square shaped—or even square keyhole shaped—tombs instead.  On the other hand, at the periphery, at the farthest reache