The Mannlicher-Carcano was known as the 'Enemies Friend" it was so inaccurate there is no way he pulled those shots off in time and, more importantly, be accurate. The legal definition of a conspiracy is an agreement between two guilty people to commit a crime so if we don't who "they" are then it's just a theory. People like to throw that word around, conspiracy, to discount whatever point you're trying to make.