Johnson/Estes/Wallace connection - there is a lot of shady stuff going on there. Lyndon Johnson was the Bill Clinton of his time as far as having a lot of shady cronies such as Billy Sol Estes and Mac Wallace. Wallace was sort of a triggerman for Johnson going back to 1952 (where he somehow gets off with probation for a murder case). Lyndon was likely getting dropped from the ticket so he has some motive.
There is ZERO evidence that LBJ had anything to do with the assassination, or any prior knowledge of it.