The problem with all these JFK conspiracies is they fail at the level of conspiracy
A conspiracy implies careful planning. Would the Soviets, Cubans, Mafia or CIA select someone like Oswald to be the key to a political assasination that could start a war?
They would have selected a PROFESSIONAL assassin. Someone who would be in Dallas under a fake name. Someone who not only knew how to shoot, but had an escape plan that would either get him out of the country or kill him. Would a professional assassin use a $19.95 mail order bolt action rifle or a top line sniper rifle?
Instead we have Oswald. Undependable and mentally unstable. Oswald had no chance at escape. The police were going to check who worked at the Schoolbook Depository. Oswald would have been red flagged. Oswald wandered the city and shot a cop. He hid in a theater. Not what you would call a professional escape plan
If you were the Soviets, Cubans, Mafia or CIA.......would you trust Oswald with your conspiracy?