So from that doc; It seems to point at it all being the workings of Linden B Johnson combined with Hoover because they were fucked otherwise from their past cover ups.

This guy Wallace (lindens sisters boyfriend) helped to set the room up cause his print was found up there on one of the boxes placed to hide the shooter:

Malcolm (Mac) Wallace : Biography

Edgar Hoover combined with the top Oil family and of course the shooter Oswald and Ruby all playing their parts.

Servants to the household and Lindens mistress all state that the top people mentioned here, met up the night before the shooting at the oil barons house and they also partied for a week after the shooting with caviar and champagne while everyone else in the world mourned.