This is just silly logic. Your "comprehensive narrative" is full of holes from one end to the other. But if no one can show you a detailed alternative narrative, you'll just keep believing in the ridiculous lone-gunman story.
If Theory A is shot full of holes and contradicted by mountains of hard evidence, a different theory must be true, even if we don't have enough information to provide a comprehensive, point-by-point narrative of that alternative theory but only a general outline of it.
There are lots of crimes where we don't know the whole story and can't provide details about many elements but where the general picture is clear. Such is the case with the JFK assassination conspiracy. It's clear there were multiple gunmen and that a cover-up followed, but we can't lay out a point-by-point, element-by-element narrative for what happened.
For instance, we KNOW from the released HSCA files, and from certain WC files, that Oswald was being impersonated in Mexico City. But we don't know who did the impersonating, who hired the impersonator, etc., etc.
We also have multiple accounts of Oswald being impersonated in Dallas before the assassination. We know the intent was to frame Oswald as a rabid, Kennedy-hating communist (actually, by nearly all accounts, Oswald liked JFK). But, we don't know who the impersonator(s) was/were, who sent him/them, etc., etc.
When the core element of your theory--that a gunman with Oswald's limited marksmanship skills hit Kennedy two out of three shots in 5-9 seconds--has NEVER been duplicated in any reenactment, one would think this would give the theory's advocates some pause, and perhaps a little humility. And by "duplicated," I don't meant where world-class, expert riflemen managed to score two hits out of the three shots on the second, third, or fourth attempts while firing under easier conditions than those Oswald would have faced.
Was Oswald A Poor Shot?