I find the theory that a secret service guy accidentally shot JFK immediately after Oswald had injured the president compelling. It is very simple, very human and probably seemed 'easy' to obfuscate.
(As I was replying to
@Mungoman just now in an earlier thread)
This is the one that I actually find most convincing!
It could have been, essentially, a tragic absolutely fatal accidental shot occurring seconds after the first, possibly-survivable, throat wound inflicted by Oswald. It would explain the stoicism of the Kennedy family, and disinclination to seek further culprits/conspiracy solutions - the bodyguard actually did his job but an accident occurred during his duty. The situation can't be remedied and seeking revenge just isn't appropriate - or in character - for his widow and family in the circumstances. The instigator of the events was Oswald for his initial attempt and they may thus have encouraged the protection of Mr Hickey
It may also explain LHO's "patsy" assertions. He knew he'd only shot JFK once, and that he didn't blow the back of his head off.
The official inquiries then fudge the issue and as Oswald is already dead, then why subject the unfortunate Secret Service man to the ire of the world? So Oswald is then reported to have shot JFK more than once and the business is done. Except it isn't - everyone could sense something was
off, wrong, strange about the death and hence the myriad CTs and silliness that's ensued.