The witness of the resurrection is what is important here.
In the Gary Habermas video, "Undeniable Historical Evidence for the Existence of Jesus", Bart Ehrman, an Atheist, provides fifteen independent sources for the crucifixion of Jesus within one hundred years; and if he died, he had to have lived.
The importance of the Apostles' witness is not that they were expert witnesses, but that they were sent forth by Jesus Christ as his witnesses to his life, ministry, death, (and most importantly), to his resurrection.
Some people are witnesses of the Holocaust because they were there. An expert witness may be an expert in the documentary evidence, left behind by the prison guards. Another expert witness may be an expert in the chimney soot of cremated bodies, who examined the soot in the chimneys.
Those who were there, and witnessed the holocaust firsthand, are not to be diminished just because they are not expert witnesses. If they don't have a Ph.D. in Chemistry and have not examined the chemical traces of the gas chambers, they won't be on the list of expert witnesses. Their testimony of what they saw, and experienced, may actually supersede the expert witnesses in a trial. They can tell you that the holocaust happened because they were there. The expert witness can tell you that what they examined is consistent with the testimony of the first-hand witnesses.
The voice of God, speaking through the Book of Mormon prophet in 2 Nephi, doesn't say the disbelieving Gentiles, (who say, we have no need of another Bible), should believe the book because the three witnesses or the eight witnesses would be expert witnesses. He didn't even say the Gentiles had to believe, as you say, just because they said it was so.
The Voice of God, printed in 1830, some 100 years before the Holocaust, questions, what thanks to the Jews, do the Gentiles give for their Bible? God is saying if the Gentiles believe the Bible they will believe the Book of Mormon, yet they that say that sola scriptura was a tenant of God and that they have no need of any other witnesses of Christ's resurrection, will suffer the same consequences as those who disbelieve the Bible.
If you lived to hear the voice of Paul, some five hundred additional witnesses were then living, you could speak with those who became physical eyewitnesses, because they put their hands in the fleshy wounds and saw with their eyes that this man had the wounds of death, and yet he was fully physically alive, even eating broiled fish and honeycomb before them.
If the witness of five hundred Jews doesn't impress you, there were some 2,500, who were a remnant of the tribe of Joseph, and some of his other sheep, living among the natives of this land, who were not experts with crucifixion, but familiar with executions by other means. They too, put their hands in the wound of his side, and hands and feet.
Tom Holland, a humanist, describes why the crucifixion of Christ was a revolutionary change to the Christian West, from the brutality of the world before. He claims that the crucifixion changes you, whether you are a humanist, atheist, secularist, or Christian. Christianity is the water in which we swim. Therefore, we have the right to choose our philosophy, giving dignity to the victim, and the lowest of the low.
Joshua Gehly compares the two most important miracles of the last two thousand years: "The cross of Christ, and the Golden Plates, Using an Established Historical Method to Authenticate Ancient Artifacts".
The world itself, cannot contain all the books that could be written of the tokens, or infallible proofs of Christ's resurrection, Sola Scriptura notwithstanding.
Your own most sacred experience will be your own token or infallible proof of the resurrection of Christ. If and when you, like Thomas and Mary Magdalene, witness the wounds of His hands, feet, and side, you will be a witness. You don't need to be considered an expert witness to be a perfectly satisfactory witness.