Jesus expounds "all the scriptures in one." This is the opposite of how critical scholarship works. It focuses on the particular, the micro-level issues and analysis, finding different parties at work in the scriptural record with different themes and agendas. And that's okay -- Nephi tells us (1 Nephi 13) that the scriptures are edited and mutilated. But under the editing, there is unifying thought and doctrine, and that's what Christ expounds.
I think the unifying stratum is the temple. That's what Nephi describes, right between the two principal visions of 1 Nephi, as "one eternal round."