Literary: This repetition of the plan is now given as instructions to the servant. Structurally, we have had the discussion of the plan, the announcement o the plan, and will yet see the implementation of the plan.
The process will be the cross-grafting of the Gentiles with the gathered of Israel, and as that process proceeds, there will be a selective destruction of some of the competing branches. While this may be the destruction of the wicked in the last days, it appears to be more directly related to a pruning of the branches of Christianity and Judaism. Perhaps some of the proliferation of competing interpretations will be diminished, so that there will be a lesser amount of competing voices to lead astray those who are returning to the Covenant.