I've spent a fair amount of time pondering this....coming to three conclusions...once Trump releases the files:
1. Oswald was a paid-CIA-worker from the day he entered the Marines.
2. Oswald did shoot/kill officer Tippet (no explanation why), but did not fire the rifle involved in the Kennedy shooting.
3. A CIA connection to the attempted assassination of France's Charles de Gaulle will be announced (from 1962).
The rest of the files....mostly BS or worthless.
It won't solve our mystery...mostly deepening it....wondering who Oswald really was.