Stories of the Japanese 00672 [Mid-Kamakura Period] The Exile of Imperial Prince Munetaka: A Mysterious Drama of Expulsion

In August of the first year of Bun'ei (1264), Tokimune assumed the position of rensho (co-signer) at the age of 13. While this was a very early debut in the political world, it is likely that Masamura judged it was time to begin teaching him the ropes of politics.
Meanwhile, in November, Tokimune's older brother, Tokisuke, was appointed as the Rokuhara Tandai Minamikata and departed for Kyoto. Some view this as a demotion, but since the Rokuhara Tandai position has been treated as a stepping stone for those who would go on to become shikken (regent) or rensho, it is unlikely to have been a demotion.
Now, the sixth shogun, Imperial Prince Munetaka, had married Konoe Saishi (1241–?) and had a son, Prince Koreyasu (1264–1326), but in the third year of Bun'ei (1266), this Imperial Prince Munetaka was exiled from Kamakura. However, the narrative style of the Azuma Kagami describing this event is strangely cryptic, and it is impossible to understand what it is trying to say.
The Azuma Kagami generally records the following three points.
First, on June 20th, it states that a secret meeting was held by four people: Shikken Hojo Masamura, Rensho Hojo Tokimune, Kanazawa Sanetoki (1224–1276), and Adachi Yasumori. It also records that on this day, a monk named Matsudono Ryoki (?—1266) went into hiding due to 'certain circumstances'.
On June 23rd, Prince Koreyasu entered Tokimune's residence, and on July 3rd, military forces gathered from all over the country raised war cries in front of the Mandokoro (Administrative Board).
Then, on July 4th, it is said that Imperial Prince Munetaka boarded a palanquin bound for Kyoto and departed Kamakura.
That is all. It can be called a meaningless record that tells us nothing.
How to interpret this mysterious account is where the skill of historians comes into play, and while there are various explanations, the most straightforward interpretation is likely as follows.
First, because there was some inconvenience regarding Imperial Prince Munetaka (such as him plotting to seize real power or engaging in conduct unbecoming of a shogun), the key figures of the shogunate likely gathered on June 20th to discuss countermeasures. There, they likely decided:
'Let us depose Imperial Prince Munetaka and make his son, Prince Koreyasu, the shogun.'
On June 23rd, they likely abducted Prince Koreyasu to Tokimune's residence as a hostage so that Imperial Prince Munetaka could not resist, and on July 3rd, the gokenin (shogunal retainers) raised war cries to intimidate the Imperial Prince, demonstrating that 'you must step down from the position of shogun, or we can kill you at any time.'
Unable to endure this, Imperial Prince Munetaka agreed to step down from the position of shogun and departed Kamakura on July 4th.
However, the connection to the disappearance of Matsudono Ryoki remains unclear. It seems necessary to examine other documents regarding this point.