Thanks for the synopsis of Hancock's and Boylan's book.
It's clear that they, JFKA "scholars" though they are, perform mental gymnastics that would make Houdini envious.
It seems as though they, for encouraged-by-KGB* reasons (can you say Joachim Joesten, Thomas G. Buchanan, Mark Lane, Oliver Stone, and Tucker Carlson, et al.?), WANT to believe the JFK assassination was a CIA-Mafia conspiracy.
They avoid the points you bring up (or create elaborate conspiracy sub-theories to incorporate them or dismiss them).
What's more, they cannot accept the fact that a sharpshooting, psychologically disturbed, self-described Marxist by the name of Lee Harvey Oswald killed JFK by firing three shots at him over 10.2 seconds in the echo chamber known as Dealey Plaza.
They cannot accept the fact that, due to sheer "luck," Oswald had a job in a seven-story building (on the sixth floor of which tall stacks of boxes were already positioned near the Sniper's Nest window) on the motorcade route, which motorcade passed by within 100 feet of said Sniper's Nest during lunchtime.
They cannot accept the fact that he missed the too-close, fast-moving, steeply-downward-angled target with his first shot at hypothetical "Z-124," that the Single Bullet Hypothesis is correct, and that JFK's head was "caught" on the Zapruder film going forward and downward about an inch between frames Z-312 and Z-313.
Most importantly, they, like most Americans, cannot accept the fact that the KGB* has been "making hay" (with their probably unwitting help!) from the anomaly-replete assassination to such a degree over the past sixty years that it has enabled (along with other KGB-promulgated conspiracy theories) the installing of "useful idiot" (or worse) Donald J. Trump as our "president" in 2017 and 2025 by "former" KGB officer Vladimir Putin.
Hint: Russia won the Cold War on 5 November 2024, and we're witnessing the destruction of our Constitutional Federal Republic as I post this.
Accept that fact before it's too late, CTs and LNs, alike.
*Today's SVR and FSB