You're welcome.
I think many make a big deal out of this doctrine. I will admit that the current watchtower has made a elitist club out of it, but it wasn't so in Russell's time. As Russell accepted any who in or outside of the Watchtower as brethren if they acknowledge they were consecrated to the Lord.
THE MYSTERY OF CHRIST
To whom, then, does the Apostle in 1 John 2:27 refer in the words ye and you? The Heavenly Father purposed, as previously stated, that more than our Lord Jesus should constitute this Anointed One. He purposed that the Lord Jesus should be the Head of an anointed company, who should constitute His Body. And this is implied in the type in the under-priesthood, who received a measure of the anointing oil. They prefigured the real Priesthood to come: "Ye are a Royal Priesthood, a holy nation, a peculiar people, that ye should show forth the praises of Him who hath called you out of darkness into His marvelous light."--1 Peter 2:9.
And as we further study, we find that this is the Mystery mentioned in the Scriptures: to wit, that the great Messiah so long promised should be composed of many individuals; and that these many individuals, with the exception of the Head, should be gathered out from the children of wrath, from fallen mankind, and should be justified through the merit of their Head--the merit of His human sacrifice.
All, then, who have joined the Lord are counted as members of that one Body, "the Church of the Living God," "the Church of the first-born," whose names are "written in Heaven." (1 Tim. 3:15; Heb. 12:23.) Looking back to the institution of the Church, we see that it could not be instituted until Jesus had presented Himself as a sacrifice, that the merit of His sacrifice might be made applicable to all those who would become members of His Body--those who would make the same consecration unto death that He had made, and who would then walk in His footsteps. At that very time there were some of this class waiting. They had been Jesus' disciples, hearkening to His words. They believed His testimony that if they would take up their cross and follow Him they should partake of His glory. Under the influence of this promise they became His followers. But they could not receive the anointing until He had made satisfaction for their sins.
Therefore our Lord instructed them to wait at Jerusalem until this blessing came upon them. The Scriptures tell us that the anointing came upon them at Pentecost. It came from the Father through Christ, after His ascension. Indeed, St. Paul tells us that all blessings come from the Father, who is the Fountain of blessings; and all come through the Son, who is the Channel.-- 1 Corinthians 8:6.
Just what the anointing is, is difficult for us to comprehend or to explain. Only in proportion as we comprehend it can we make it plain to others. The Lord has endeavored to make it as plain as possible to us by the use of various terms and figures. He calls it a begetting, in the sense that a new life is started. The spiritual nature begins in us at the moment we receive this begetting. And whoever receives it cannot retain it unless he grows and has the Lord's Spirit perfected in him.
Watch Tower, February 1st, 1914, page 36