Wouldn't Texas be about the "safest" place for LBJ to get away with it, because he would have had more clout with state and local law enforcement than anywhere else in the US?
There are some good points to think LBJ was connected but ultimately I’m not convinced. Many who watched him during those hours just after the assassination felt LBJ was scared out of his mind that the Russians, the Cubans or both were about to launch a full-on attack. Lyndon was a lot of things but a skilled actor was not one of them. Someone like him never needed to hide his true intentions.