One of the most effective tactics employed by the JFK assassination was to "muddy the waters" by bringing in as many "suspicious" individuals as possible into the assassination arena, even having different reasons for each person's p[resence -- if there were a covert reason for being in Dallas on November 22, 1963, all the better. Scores of people were engaged in varied peripheral plots and sub-plots, many of which were related tangentially or not at all to the actual assassination. As a result, the pertinent facts drowned in a contrived whirlpool of suspicious but not necessarily related activity.
But who was REALLY involved?
Rodney Stich's book 'Defrauding America' tells of a deep-cover CIA officer assigned to a counter-intelligence unit, code-named Pegasus. This unit had tape-recordings of plans to assassinate Kennedy from a tap on the phone of J. Edgar Hoover.