After going through all of the Otzar sources, and then moving on, at a friend's suggestion, to looking for sources on Google Scholar but not finding anything with any dramatic new spin, I momentarily turned my attention to something interesting I came upon when looking into Martini's Pugio Fidei. Apparently Martini had a source that stated there were two Bar Kozibas, one descended from the other. I only read this in an essay on PF, and haven't looked at the text itself. But what's interesting is that Ra'avad Ha'rishon also writes this in his book Sefer Hakabbalah. Not having yet seen the story in PF, I can't say whether Martini explicitly stated that Sefer Hakabbalah was his source or not.
In any case, I started moving from the subject to subject, and eventually came across an interesting essay by Samuel Levey. He opined that in Chazalic sources, Rabbi Akiva was the original Mashiach ben Yosef. Sources about Mashiach ben Yosef only come after R"A's time (I haven't looked into this yet, but that's his view). He pointed out that Mashiach ben Yosef arrives (and dies) before the coming of Mashiach ben David, and - though he doesn't say this - Rambam after all called Rabbi Akiva Bar Kochva's arms-bearer (נושא כליו).
Thinking about this for a few minutes, I realized that the idea ties into an idea I had years ago, when I was in the army: Rabbi Akiva's name has the root עקב, heel - as an arms-bearer, he may walk at the heel of Bar Kochva. But a deeper understanding is that he is the literal עקבתא דמשיחא, the heel of the Mashiach, which comes before the Mashiach himself.
And then it hit me: What if Rabbi Hillel, when he said that Mashiach was "eaten" in the time of Chizkiyah was calling Rabbi Akiva Chizkiyah? Now my focus is to see whether there's evidence to connect the two. One strong piece of evidence is that it's said that in the days of Chizkiah people from Gevat to Antipras knew Torah, and those are the two boundary-markers of the students of Rabbi Akiva according to the gemara, as well as the markers of towns destroyed by Hadrian during the Bar Kochva Revolt.
There might be some conceptual connection also with the idea that R' Yehudah Leib Yafo brought, that Chizkiyahu took apart the Israelite blockades but the Israelites didn't come to Yerushalayim, and Rabbi Akiva is the one who stated that the Ten Tribes won't be redeemed.
There's also the idea that Rabbi Akiva was one of the greatest proponents of Shir Hashirim as a holy text and Chizkiyah and his men were the ones who edited it.
As for Rav Yosef, I just came across an idea by the Chida. He wrote on the story of Rabbi Akiva and the sages, asking how it's possible that R"A doubted the fulfillment of Zechariah's prophecy, and explained that R"A wasn't sure whether Zechariah's prophecy was only applicable to Bayit Sheni or was also applicable to Bayit Shlishi. Upon seeing that Uriah's prophecy came true both after Bayit Rishon and Bayit Sheni, he knew that the same would be true for Zechariah's prophecy.
It's possible - but of course, it's late at night and I need to think about all of this with a clear head - that Rav Yosef's intention was to remind Rabbi Hillel that Zechariah's prophecies were still applicable. There will be a time in the future where Bat Tzion will rejoice greatly, which did not really happen while Bar Kochva waged war against Hadrian.
In any case, I started moving from the subject to subject, and eventually came across an interesting essay by Samuel Levey. He opined that in Chazalic sources, Rabbi Akiva was the original Mashiach ben Yosef. Sources about Mashiach ben Yosef only come after R"A's time (I haven't looked into this yet, but that's his view). He pointed out that Mashiach ben Yosef arrives (and dies) before the coming of Mashiach ben David, and - though he doesn't say this - Rambam after all called Rabbi Akiva Bar Kochva's arms-bearer (נושא כליו).
Thinking about this for a few minutes, I realized that the idea ties into an idea I had years ago, when I was in the army: Rabbi Akiva's name has the root עקב, heel - as an arms-bearer, he may walk at the heel of Bar Kochva. But a deeper understanding is that he is the literal עקבתא דמשיחא, the heel of the Mashiach, which comes before the Mashiach himself.
And then it hit me: What if Rabbi Hillel, when he said that Mashiach was "eaten" in the time of Chizkiyah was calling Rabbi Akiva Chizkiyah? Now my focus is to see whether there's evidence to connect the two. One strong piece of evidence is that it's said that in the days of Chizkiah people from Gevat to Antipras knew Torah, and those are the two boundary-markers of the students of Rabbi Akiva according to the gemara, as well as the markers of towns destroyed by Hadrian during the Bar Kochva Revolt.
There might be some conceptual connection also with the idea that R' Yehudah Leib Yafo brought, that Chizkiyahu took apart the Israelite blockades but the Israelites didn't come to Yerushalayim, and Rabbi Akiva is the one who stated that the Ten Tribes won't be redeemed.
There's also the idea that Rabbi Akiva was one of the greatest proponents of Shir Hashirim as a holy text and Chizkiyah and his men were the ones who edited it.
As for Rav Yosef, I just came across an idea by the Chida. He wrote on the story of Rabbi Akiva and the sages, asking how it's possible that R"A doubted the fulfillment of Zechariah's prophecy, and explained that R"A wasn't sure whether Zechariah's prophecy was only applicable to Bayit Sheni or was also applicable to Bayit Shlishi. Upon seeing that Uriah's prophecy came true both after Bayit Rishon and Bayit Sheni, he knew that the same would be true for Zechariah's prophecy.
It's possible - but of course, it's late at night and I need to think about all of this with a clear head - that Rav Yosef's intention was to remind Rabbi Hillel that Zechariah's prophecies were still applicable. There will be a time in the future where Bat Tzion will rejoice greatly, which did not really happen while Bar Kochva waged war against Hadrian.