In Chronicles 1:9:1-34 there's a description of the people who settled in Yerushalayim. There's a disagreement among commentators whether these people settled in Yerushalayim during the Second Temple period and this chapter is another version of Nechemiah 11:1-36, or if it's referring to another period entirely, from sometime during the First Temple period. There are noticeable differences between the two chapters. One difference is that only in Chronicles are people from the Tribes of Menashe and Ephraim mentioned to have settled in Yerushalayim:
"while some of the Judahites and some of the Benjaminites and some of the Ephraimites and Manassehites settled in Jerusalem." (ibid. 3)
My question is not why they aren't mentioned in Nechemiah, but rather: The leaders of the people of Yehudah, Binyamin, the Kohanim and Levi'im are listed by name, while the leaders of Menashe and Ephraim are not. Why is this so?
I read a theory presented by Rabbi Dr. Yehoshua Brand on this, but it seemed way too conspiratorial to me and didn't appear to really fit in with what we know of the character of the authors of Tanach1. After all, Ezra and Chronicles were both written by Ezra, and the portion of Ezra that's dictated in the first person appears to have been written by Nechemiah, who was a contemporary of Ezra, and the two were both great and wise men. So I'm looking for something different.
1 It's an interesting idea nonetheless in my opinion, so I recommend reading, if you can get a copy of his book כלי זכוכית בתלמוד (Glassware in the Talmud). It's in the second section dedicated to various essays not relating to the main subject of the book. I don't remember the title, but it's got something to do with ברית דמשק - the Damascus Covenant. In short, with regards to the verse in Chronicles, he posited that the people of Judea initially welcomed returnees from the Ten Tribes who were living in the remains of the Assyrian Empire, but the Judeans were too proud a people and looked down upon them and refused to let them to actually be counted and listed among them in most official records.