Well, releasing ALL the documents would be a good start. Seeing as how it is over 50 years after the fact, when all of the principles are now dead, that should not be too much to ask.
Henry Kissinger is 99. Plenty of people from that era are still alive.
More importantly, if there's information on specific CIA informants in there, their networks and the people they recruited may well have survived them.
To paraphrase Pulp Fiction, "When you conspiracy theorists get together, you're worse than a sewing circle."
I suspect the remaining redactions are because they're waiting for certain people to pass away. Probably not major players but there could be people who were in their 20's or 30's in 1963 who had some knowledge of what happened. Once they've all died off it will be forever impossible to prove anything because anything really damning would never have been written down or the records would have been destroyed years ago.