No.

It was a Jewish rabbi and commentator. As far as I'm aware he did not attempt to rewrite the story with his conclusion included as definitive. You would have done better to choose the story about the adulterous woman, which WAS added later. Naturally, various historical techniques identified this.
No, you would have done better to understand the example.
This particular chosing is a good one because it is done by a person writing an addition to an existing story and we know for a fact who said it and that he wrote hit many many many years after the original was written.
Clearly, he added the reasoning of why the bears were sent. He is adding facts to what one might percieve as history.
This is the form of fan fiction that religion has been using for years.
For example, on Moses's birth it is said that his mother thought he was "good".
Rashi said that when he was born, the entire room was filled with light.
Raba on the other hand, said that Moses was born prematurely and thus his mother was surprised he was even alive (read: good).
Both of these rabbies are basically adding facts to a known story.
No conspiracy involved period.
The stories expanded on the existing "gospel" while getting some details similiar and some details different.
None of this requires moses or elisha to have been a real people at all.
2) correct. 3) it seems likely that he did.
You're really introducing an unreasonable level of doubt, that would get us to the point of saying "we cannot know anything about minor historical figures". History has to work with what its given, and find out what is probably true.
On the contrary. It's exactly a reasonable level of doubt.
We have real life people today where we still question whether or not they really believe their crap or are just making it up.
Heck, we even have Poe's law.
If for something that happens in modern times you have far better information and documentation and still can't deduce it, you don't get to magically claim to do so when there are even less evidence involved.
If you can't tell if Rashi was really trying, at the very least, to teach other people what he thought was real history, then you can't do that on the writings of the NT. It really is that simple.
Number 3 seems incredibly unlikely, partly because they would all require similar sources and all be aware these sources are fabricated
Does it matter if Rashi knows if the bible is forged or not to write his fan fiction?
, but mostly because, when you come across multiple independent sources, the chance that "they're all lying" just isn't one historians bother with.
Exactly. Remember I mentioned the writings on Omri several pages ago?
That's an independant source. The NT is not an independant source.