To be fair, part of the problem is with the different possible senses of the word mediator. Some may use it in a GENERAL sense in speaking of Christ's role in mediating prayers. As with the term "born again," most religions improperly apply the term "mediator" to Christ in this common way, as our mediator in prayer or of Christ as our means of salvation.
However, Witnesses are interested in Scriptural accuracy even in the way they use specific terms.
And if we take the strict Scriptural usage of the word "mediator" we find that MESITHS is definitely used with a definite legal and technical sense in five out of six occurrences (Heb.8:6; 9:15; 12:24; Gal.3:19-20). Christ is the "mediator" of the New Covenant which is *only* made with those 144,000 who will rule with Christ in heaven. Thus, in the strict Scriptural sense, Jesus is not the "mediator" of those with the earthly hope. ("Insight On The Scriptures" Volume 2, pg 362).
This quote is found in the Watchtower 8/15/89; 30: "The Greek word me si'tes, used for "mediator," means 'one who finds himself between two bodies or parties.' It was a 'many- sided technical term of Hellenistic legal language.' Professor Albrecht Oepke (Theological Dictionary of the New Testament) says that me si'tes was ‘one of the most varied technical terms in the vocabulary of Hellenistic law.' ... Does this mean that there is a specific legal sense involved in Jesus' role as Mediator? Yes. Note Paul's comment at Hebrews 8:6: "Jesus ...is also the mediator of a correspondingly better covenant, which has been legally established."...The new covenant was "legally established." It laid the basis for some of Christ's followers, beginning with the apostles, to gain "entry into the holy place," heaven itself.-Hebrews 9:24; 10:16-19."
The only use of MESITHS which is not specifically in a covenant context is 1Tim.2:4-5. However, it is only reasonable to understand that Paul was here using the word "mediator" in the same way he did in his five previous writings.
"Hence, Timothy would have understood Jesus' mediatorship to be His legal role connected with the new covenant. The Pastoral Epistles, by Dibelius and Conzelmann, acknowledges that at 1 Timothy 2:5 'the term "mediator" has a legal significance,' and "although in this passage, in contrast to Heb 8:6, the [covenant] is not mentioned, one must nevertheless presuppose the meaning 'mediator of the covenant,' as the context shows." Professor Oepke observes that 1 Timothy 2:5 presents Jesus as "the attorney and negotiator."..."Consequently, 1 Timothy 2:5, 6 IS NOT USING "MEDIATOR" IN THE BROAD SENSE COMMON IN MANY LANGUAGES. It is not saying that Jesus is a mediator between God and all mankind. Rather, it refers to Christ as legal Mediator (or, "attorney") of the new covenant, this being the restricted way in which the Bible uses the term." --WatchTower 8/15/89; 30
Though in the strict sense, AS USED IN THE BIBLE, the term "mediator" is only applied to the 144,000 in the New Covenant. However, some still may use it in a general sense in speaking of Christ's role in mediating prayers. However, this is described in the Bible using different words; we pray “in Christ’s name” and “through Christ” so there is no communication lacking between God and the Great Crowd!
What many Witness opposers ignorantly attempt to do is to link Christ's being the "mediator" with the ransom provision for all. This is not correct.
We do NOT believe that "only the 144,000 are able to have their personal sins forgiven by the shed blood of Christ." Even those who have the earthly hope and are not participants in the New Covenant have their sins forgiven by the ransom (w8/15/89; 31). John showed that the ransom was for both groups when he said: "He is a propitiatory sacrifice for our sins, yet not for ours only but also for the whole world's"--1Jn 2:2
w79 4/1 31 Questions from Readers
Is Jesus the "mediator" only for anointed Christians?
The term "mediator" occurs just six times in the Christian Greek Scriptures and Scripturally is always used regarding a formal covenant.
...Christ, is the "mediator of a new covenant" between Jehovah and spiritual Israel, the "Israel of God" that will serve as kings and priests in heaven with Jesus ... The "great crowd" of "other sheep" that is forming today is not in that new covenant. However, by their associating with the "little flock" of those yet in that covenant they come under benefits that flow from that new covenant. During the millennium Jesus Christ will be their king, high priest and judge.