My opinion is that Oswald used the scope for the badly missed first shot and then, realizing that the scope was misaligned, used the iron sights for the second and third shots.
So Oswald truly was a superhuman marksman then? I'd like to see someone match that feat exactly how you describe it. Expert marksmen couldn't even do it with a sighted scope. So after Oswald's 1st shot, he realized his scope was wonky, so he switched to the iron sights to score a 2 for 2, all in under 10 secs?
You keep telling yourself that. But if he was such a super-marksman, then surely he would have known the scope would be useless and removed it from the rifle before smuggling its parts into the TSBD in a paper bag, correct?
BTW, the fact that it took 3 shims to realign the scope before the FBI could even hit the target means the scope was never sighted-in. No way. Which means Oswald must have practiced with the rifle with the wonky scope and didn't bother to sight it in or else he never shot the rifle. WTF? Otherwise, there is no way an unpracticed shooter could have possibly pulled off a 2 for 2 on that day, the way you describe it.
How come Oswald didn't take the 1st shot as the limo turned onto Elm? Sitting duck served up on a silver platter. It didn't get any better than that.