One important distinction is the New Covenant being only between Jesus and the 144K. The Master's 'belongings' are the Great Crowd--which incidentally, we've recently discovered--were NOT given to the FDS as previously taught, in 1919.
How many current J-Dubs are aware Jesus is NOT their Mediator directly, but that the FDS is in that role? The Bible is not for Other sheep directly, either.
Great Crowd huddle like starved mongrels at the table of the FDS begging for scraps!
It hasn't yet been clarified (at least, not to me) WHY other sheep go door to door since the Great Commission was directed at the FDS.
Perhaps we'll see this as part of the flood of 'New Light' in Watchtower as yet unpublished?