In this trip to the nethermost parts of the orchard the branches in the poor, and poorer, soil have been disregarded. This visit is to the branches that had manifest two aspects, tame and wild. This is a return to the Nephites and Lamanites. The result of the examination is that all of the branches have become corrupt The promise of the good branches was not fulfilled.
This part of the allegory deals with the fall of the Nephites from the Grace of God (in that they were not longer under his protective care). The end of the Book of Mormon has the Nephites in greater sin that the Lamanites. This is the time period alluded to in this allegorical visit.