"Educated guesses"? "We don't need to know..."? The guy harping about Proof and Evidence is NOW forced into considering, "educated guesses", and then running away with, "We don't need to know..."? Hilarious back peddling.
Just because we don't know everything doesn't mean we need to ignore what we do know. We know where Oswald's second and third shots struck. Nothing that could have happened with that first shot changes the fact Oswald's second shot hit JFK in the upper back and went on to seriously wound JBC. His third shot struck JFK it the back of the head causing an unsurvivable massive brain injury. We have proof of that.
There are a number of things we don't know and probably never will. We don't know Oswald's motive nor do we need to know in order to prove he was the assassin. He would be nice to know but because he never admitted to what he did, he never would have told anyone why he did it. He didn't leave behind a manifesto explaining his actions and there was no social media in those days which often gives clues as to the motives off modern day crackpots.
If you want to be anal and take the position that the case is unsolved because we can't prove every single detail, that's your choice. I'm perfectly content knowing that Oswald was the assassin and there isn't a scrap of evidence indicating he had even a single accomplice in his crime and I really don't care where his first shot went.