In the allegory, we meet the lord of the vineyard. He is the overlord, but it is his servant who comes and directs all of the things that are going on. I think that the overlord, the owner, is God the Father, and the long-suffering servant, as in Isaiah, is always Christ. I think Jacob may have said, "Can you not see that this prophet understands, as we understand, that Christ will come, and that it will be his law and his orders that we will follow?" Jacob introduced his telling of Zenos’s allegory by stating: "And for this intent we keep the law of Moses, it pointing our souls to him; and for this cause it is sanctified unto us for righteousness" (Jacob 4:5).
Sanctification, or being made holy, is what the anointing with the olive oil was all about, as reflected in the purification rituals of the temple. Jacob was trying to communicate that sanctification is ultimately through Christ! The word Christos or Messiah means "the anointed one," and what were they anointed with? Olive oil. Again, a couple of chapters in the Allegory of the Olive Tree book elaborate on the importance and symbolism of the anointing.
Jews believed in Jehovah well before the coming of Christ. Regardless of whether Jehovah for them represented the Father or the Son, Jehovah at least represented a very important person who interacted with God and got orders from him. In the allegory, the master of the vineyard has a servant who is in some ways equal to and working together with the Father. Jacob probably understood the Father to be the owner of the vineyard, but the servant is the suffering servant, the Messiah or Christ, who boldly pleads with the master to spare the tree a little longer.
There are places in which it clearly appears that Nephi understood that the Messiah would be different from God the Father. Jacob, in the contests with Sherem, was tested and pushed on whether there would be a Messiah who would come, and whether the Messiah and God are two different beings. This is a very important doctrinal issue.
Donald W. Parry, "Ritual Anointing with Olive Oil in Ancient Israelite Religion," in The Allegory of the Olive Tree: The Olive, the Bible, and Jacob 5, ed. Stephen D. Ricks and John W. Welch (Provo and Salt Lake City, UT: FARMS and Deseret Book, 1994), 262–289.
John A. Tvedtnes, "Olive Oil: Symbol of the Holy Ghost," in The Allegory of the Olive Tree: The Olive, the Bible, and Jacob 5, ed. Stephen D. Ricks and John W. Welch (Provo and Salt Lake City, UT: FARMS and Deseret Book, 1994), 427–459.
Book of Mormon Central, "Did Pre-Christian Prophets Know About Christ? (1 Nephi 10:17)," KnoWhy 12 (January 15, 2016).