When considering motive, it must be considered where LHO received his financing from over the years. He made a trip to Russia and Mexico. The first trip paid for by saving money during the time of service as a US marine. There is no account of how he convinced the Russians to give him a factory worker job in Minsk and how he was able to live comfortably there and be repatriated later, especially after serving in the US Marine Corp.
Conveniently this dead man's tax records or bank accounts? are left hidden so you are unable to determine who was paying him for sure when he returned to his life in the US. His W-2s should have been proof for all the various jobs he held after coming back. Did he not pay taxes and have wages withheld by his employers? That proof has never been provided. He seemingly could never hold a job until he got the TSBD job where his boss Truly said he was "an above average employee"! Those short employments would have created tax liabilities and records which any sane investigator would have investigated.
The records such as his W-2s would prove/disprove who was bankrolling him on his endeavors. It is possible he kept all his money "in his pillow" but if he had a repatriation loan when he moved from Russia to the US for $435.71 on June 1, 1962, how did he pay it back or did it remain outstanding? This record may not have clarified whether or not he was on the CIA's "non-taxable" payroll but it certainly would have been looked at to confirm W-2s and tax records from his various places of employment to verify the accuracy of the statements made by his employers.
Furthermore, this US Marine achieved a 191 score as "marksman" in 1959 but yet failed to hit his stationary target Edwin Walker at 100 feet - so the story goes ,unconfirmed but presumed! This same gun was "assumed" to be the one to kill JFK, his shooting ability much improved by this time, able to land at least 2 shots from a bolt action rifle on a moving target in a few seconds at a much greater distance!
If his IQ was fairly low, he may have been convinced by his handlers to go along with the charade. Some people are gullible and can be led down a garden path, told they are the greatest double agents on the earth and follow orders in a spy/espionage game where they think themselves heroes and great patriots. Unbeknownst to them, they then find themselves tied into the plot and framed to become the patsy. Then it is too late to end the game and they are the pawn. Take out the pawn and the story never has to be revealed, case closed!