JC--
My best guess is the GK diversion was created to allow LHO and a second shooter better odds of leaving the TSBD unmolested. Indeed, police manpower was split up in the immediate aftermath of the JFKA. The diversion broadly worked.
In any event, the second official investigation into the JFKA, the HSCA-1979, concluded there was likely a JFKA conspiracy. The HSCA was full of smart and skeptical guys, who did not buy into sub-CTs, such the BYP pics being fake, or that LHO never ordered a weapon.
Unfortunately, the HSCA did not conclude who LHO's co-conspirators were. Some HSCA members say they ran out of time. I think they may have been barking up the wrong trees (CIA or Mob, rather than G2, DGI or KGB).
On the other hand, the WC LNT resulted from LBJ's diktat that nothing be found that might trigger a nuke war with Russia. At that time, a very real and tangible possibility, since the US and Russia had nearly nuked it out over Cuba in 1962. So was born the WC-LNT, also an unproven narrative. In some ways I do not blame LBF. Even if the KGB-G2 had assassinated JFK, a nuke war would be a horrible result.
The WC-LNT never even faced a legal test in court, let alone a compelling scientific test.
So, we have two unproven narratives regarding the JFKA.
Draw you own conclusions.