If the evidence I listed isn't enough to convince you Oswald was the assassin, I can't help you. It would be sufficient for anyone with an ounce of common sense.
I don't need to put Oswald in the sniper's nest when the shots were fired. Oswald put Oswald in the sniper's nest when the shots were fired. It's amazing that you accept that Oswald took part in the assassination but can't bring yourself to acknowledge that he was the one that pulled the trigger. The strongest argument that it was Oswald who fired the shots are the fibers that matched his shirt found on the butt plate of the rifle. The recoil of the rifle would forcefully drive the butt plate into Oswald's shirt. Here's where common sense enters into the picture. That is why fibers from Oswald's shirt were on the butt plate of the rifle. You have zero evidence that anybody else was in the sniper's nice when the shots were fired but you are more than willing to simply ignore all the evidence it was Oswald who fired the shots and assume somebody else did. The forensic evidence alone screams that Oswald did it, but you and every other conspiracy hobbyist over the past six decades are desperate to believe it was anybody but Oswald who did it. Why is that?
I know this is almost a rhetorical question, but what evidence do you have that "Oswald knew their plan was falling apart when he was confronted that quickly". We both know you don't deal in evidence. Assumptions seem much more appealing to you then what the evidence indicates.
One last point. Anybody who believes the nonsense you believe in which isn't supported by a shred of evidence ought not be casting aspersions about other people's "sound judgement".
So a prosecuting attorney proffers to the jury that the Proof of a defendant being at the murder scene is, "he put himself there"? That's, "My Cousin Vinny" material.
It's Oswald's rifle, so naturally there would be traces of his shirt, prints, skin, etc on the rifle. So what? Same goes for anything connected to the blanket.
I believe that Oswald was supposed to establish his alibi by being inside the lunchroom at lunchtime. When Officer Baker confronted Oswald so quickly, Oswald knew something had gone wrong. Maybe Oswald had that false ID on him, and he thought he was lucky that Officer Baker did Not pat him down? So he split via the Huge Gates.