I wonder if he used hypnosis to improve his playing ability. He was introverted, he liked to play video poker and possibly he was placed in a trance like state by someone. According to Wynn he was a rational person. I heard a story about Edgar Cayce recently. Under hypnosis he became a doctor. I dont think he Mr. Phelps of mission impossible but he does sound like he could be a split personality. Did he send his girlfriend away or did she have him send her away. No way to prove mind control but they are still looking for a motive. He didnt drink. However he could have been enhancing his mental concentration in an unknown way. What do they say about AI… Summoning the demon.
Just speculation. What did Sherlock say. When you exclude the possible and all you have left is crazy. It may be true.