If Oswald had survived, what would have been different?
Oswald would have been on trial, and what would not be on trial was, "Was it a conspiracy?"
Why? Because that is not germane to Oswald's guilt or innocence at trial.
He was arraigned for the murder of JFK and Tippit. Conspiracy to commit murder was not what he was arraigned for and was not what he would be tried for.
He would have stood trial for those two murders, most likely in two separate cases.
Oswald's lawyer would try to create reasonable doubt or possibly convince Oswald to plead insanity, but Oswald would not go for an insanity defense.
But trying to create reasonable doubt by bringing up, for example, Oswald's supposed CIA connections would be thrown out by the judge as not germane to the case.
The CIA wasn't on trial. Oswald was.
You want to deal with the evidence against Oswald now as if this was a real trial?
Plenty of CTs have tried. None have succeeded in making a case.
Hank