So what if Castro had JFK shot?

[Spider Jerusalem]

1. That would require that Oswald was a Cuban agent.

Something for which there's no evidence.

It would also require that Oswald was the luckiest son of a bitch on the planet, because he got the job in the TSBD, on what would be the motorcade route, over six weeks before that route was finalised. Which would mean that the Secret Service were complicit. And Kennedy's close friend Ken O'Donnell was complicit, because he made the final selection of the Dallas Trade Mart as the site of Kennedy's lunch event that day (the route to the Trade Mart from Love Field went past the TSBD).

All the evidence says that it was Oswald. It was his rifle, and the shots came from the sixth-floor window of the School Book Depository.