Which can be boiled down to this:
Oswald did it. The Warren Commission was right about the basic facts. But according to the acoustic evidence someone unknown person for unknown reasons fired an unknown shot from the grassy knoll that didn't hit anything.
Of course later on the acoustic evidence was debunked, which left only the Oswald did it part still intact.
IF there was another shot fired from another gun <3 seconds from the shots Oswald fired there is no "unknown reason" about it and we don't know it hit That shot was to assassinate a President. Not sure about acoustic evidence but the video of Kennedy's head slamming backwards always made me believe that last shot came from the front. No question Oswald fired did the basic crime and it is indeed possible he fired all the shots that hit Kennedy and there is some bizarre physics at play here in regard to the last shot. Maybe the driver hit the gas pedal at exactly that moment?
In 2003, Robert Blakey, staff director and chief counsel for the Committee, issued a statement on the Central Intelligence Agency:
...I no longer believe that we were able to conduct an appropriate investigation of the [Central Intelligence] Agency and its relationship to Oswald.... We now know that the Agency withheld from the Warren Commission the CIA-Mafia plots to kill Castro. Had the commission known of the plots, it would have followed a different path in its investigation. The Agency unilaterally deprived the commission of a chance to obtain the full truth, which will now never be known. Significantly, the Warren Commission’s conclusion that the agencies of the government co-operated with it is, in retrospect, not the truth.
http://en.wikipedia.org/wiki/House_Select_Committee_on_Assassinations#General_conclusions
Let’s not forget as well, the Warren Report and HSCA contains pages of testimony and tests. It certainly is a bit more than just the verdicts reached by men like Earl Warren and Allen Dulles.
McAdams the website has a lot of HSCA info if not all of it, the website is not even working now. Maybe too many people are trying to access it. http://mcadams.posc.mu.edu/russ/jfkinfo/jfk8/hand.htm Time Magazine just did an article mentioning him.