And let me guess, the Book of Mormon is the “other record” you are alluding to in your “single tribe” comment?
The bible itself speaks of other records written by prophets and apostles among the tribe of Judah, yet they aren’t in the bible now. Where did they go?
The tribe of Judah is only one of 12 chosen tribes. Yes, I believe the Book of Mormon to be the record of another tribe, the tribe of Joseph. I don’t limit God’s dealing with his peoples.
In the mouth of two or 3 witnesses shall EVERY word be established. - 2 Corinthians 13:1