I think you are just making up all kinds and any kind of excuse and objections you can find. So why should I take them seriously.
For you to dismiss primary and secondary sources of historical accounts, on the basis of speculation, due to an absence of details we don't have, seems to me, quite unreasonable.
Primary and secondary sources. Primary sources provide a first-hand account of an event or time period and are considered to be authoritative...
I think it's appropriate to repeat
this post for you also.
We simply do not have enough information to explain with any certainty how John got he information, he personally did not witness. However, to dismiss all the other information, of an eyewitness, on that basis, suggests to me, that you have already made up your mind to ignore anything that can reasonably be considered reliable.
So, no explanation would be enough to remove that skepticism.
Recall what the detective said... He had to let go of his closed-mindedness - his volition.
John could have gotten his information, a number of ways.
The scriptures show that Romans did convert to Christianity.
Today, we see this. When someone converts, they share information we wouldn't have obtained otherwise.
You would observe this, when you watch documentaries.
So one way, could have been through a soldier.... but why speculate on information we don't have? It proves neither side.
You are accusing the writers of lying, when you have no basis for doing so, other than your feelings.
The proper way to go about this, is not using opinion, based on emotions, but rather we should look at the facts, and using the different criterion in the historical methodology, we see they had no reason to lie. Their candor is evident throughout the texts.
That's my final word on these speculations.
If you have objections about the historical method, I don't mind discussing those. You can let me know.