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I think the highlighted ones are relevant, as far as in Mark it could be any number of reasons.
He or they may have thought it was covered enough and other things that weren’t were to be covered by him? I’ll have to go read and see.
Luke 1
New International Version (NIV)
Introduction
1 Many have undertaken to draw up an account of the things that have been fulfilled[a] among us, 2 just as they were handed down to us by those who from the first were eyewitnesses and servants of the word. 3 With this in mind, since I myself have carefully investigated everything from the beginning, I too decided to write an orderly account for you, most excellent Theophilus, 4 so that you may know the certainty of the things you have been taught.
They obviously didn't all talk to the same witnesses at the same time but the main message wasn't confused.
Concerning the material from Luke in boldface, do you believe that the author of Luke and Acts was actually one of Paul's traveling companions? If so, how do you account for him failing to mention the over 500 brethren to whom the risen Christ appeared, according to 1 Corinthians? Such a stunning evidence of the Resurrection isn't something you would leave out. So, to account for the fact that none of the gospels report this, there are a number of possible reasons I can think of, off-hand:
1) Paul wrote about this to the church in Corinth, but didn't tell Luke about it.
2) Paul did tell Luke about it, but he didn't think it was important enough to include in his gospel.
3) All the gospel writers were aware of this story, but discounted it as being unlikely.
4) None of the gospel writers included the 500+ brethren, because it wasn't originally in 1 Corinthians, but was inserted in the process of transmission by a later editor.
I find 1) and 2) highly improbable. Explanation 3) is possible. However, since the passage in 1 Corinthians shows signs of tampering, I suspect that 4) is the most likely explanation. Here's the passage as it now stands 1 Cor. 15:3 - 8:
For I delivered to you as of first importance what I also received, that Christ died for our sins in accordance with the scriptures, that he was buried, that he was raised on the third day n accordance with the scriptures, and that he appeared Cephas, then to the twelve, Then he appeared to more than five hundred brethren at one time, most of whom are still alive, though some have fallen asleep. Then he appeared to James, then to all the apostles. Last of all, as to one untimely born, he appeared to me.
It is quite apparent from Paul's epistle to the Galatians that James, not Peter (Cephas), is in charge of the church in Jerusalem. This would be unlikely if James were so far down the line in order of appearances and if Jesus appeared to Peter first. Also, let us remember that Peter (Cephas) is, after all one of the twelve. So, if there was tampering that demoted James, as well as adding the 500, the original passage would have been as follows:
For I delivered to you as of first importance what I also received, that Christ died for our sins in accordance with the scriptures, that he was buried, that he was raised on the third day n accordance with the scriptures, and that he appeared James, then to the twelve, then to all the apostles. Last of all, as to one untimely born, he appeared to me.
Note that in the passage as we have it now, there is a widening circle to whom Jesus appears, but one that is disrupted by the appearance to James:
1) Jesus appears to Peter (Cephas).
2) Jesus appears to the 12.
3) Jesus appears to over 500 brethren.
4) Jesus appears to James.
5) Jesus appears to all the apostles.
If this is, in fact, an altered version, and my version is what the original was like, then the widening circle isn't broken:
1) Jesus appears to James.
2) Jesus appears to the 12.
3) Jesus appears to all the apostles.
Also, this would explain the failure of the gospels to include the 500+ brethren. Of course, there's still the possibility that the gospel writers, who, after all, do not conform in any way to the passage in 1 Corinthians, may have simply ignored Paul in the process of writing their own fictional accounts.
A possible reason for this is that Paul seems to have had some sort of conversion experience, which would seem to be visionary. So, he might well have understood the other appearances to likewise have been visions. Starting with Mark, the gospel writers might well have altered this to be a physical, rather than spiritual, resurrection, Mark's view being that the physically resurrected Jesus would have immediately ascended to heaven, leaving only the empty tomb as evidence. Succeeding gospel writers probably found this as unsatisfying as most of those reading it do today; hence the varied accounts in of post-reurrection appearances of Jesus
in the flesh in Matthew, Luke and John.