Huh? The physical evidence that links Oswald to the crime has always been rock solid but listen carefully, the OP is all about the CT's multiple unagreed theories that attempt to extrapolate disparate insignificant pieces of evidence into an unexplained contradictory narrative that could never possibly make logical sense, for instance having a triangulated shooter in front of Kennedy when your patsy is behind, has and always will be straight up ridiculous, but undeterred 55+ years later we still have naïve CT's pushing this lunacy.
JohnM
The questions you asked in the original post reveal a sort of "motivated incuriousness" on the part of the Oswald defenders in general and the conspiracy advocates specifically. Motivated, deliberate, willful lack of curiosity.
As in: if there was a large scale conspiracy done by powerful groups behind the event then "Why didn't they plant witnesses in Dealey Plaza to say they saw Oswald shoot JFK?" Isn't that obvious? Or "Why didn't they make Marina say Oswald hated JFK?"
Wouldn't a curious person about this matter ask those questions? Wouldn't someone looking at the conspiracy claims raise them? Out of curiosity?
There's a motivated and deliberate lack of curiosity about these areas that expose the good faith questioners about the evidence from the bad faith questioners. This is an example of one.
But if one wants to be a sort of Mark Lane here defending Oswald (Lane did it to for ideological and personal reasons; why are others doing it?) then never mind.