"the route itself was not announced until days before JFK’s arrival in Dallas."
Prove it.
Whether one wants to accept it or not, Marina says he did try it and Oswald's friend DeMohrenschildt seemed to indicate something strange about Oswald per the attempted shooting earlier in 1963 of retired General Edwin Walker.
At the same time, DeMohrenschildt (who knew Jackie's family too) committed suicide of course years later in the '70s and Walker didn't necessarily buy the official Warren Report himself, interesting character, Walker. Helped enforce desegregation in Arkansas in the '50s, once retired, Walker led protests at Ole Miss against James Meredith becoming a student there.
Still, nothing really conclusive and I just don't have the conspiracy-bend anymore. The theories that exist are all so different, mob, Hoffa, Mafia, Cuban Exiles, Cubans, Castro, and of course, those who blame our own Federal Government.