well..not really. He , Gerard, was for some time, running a long term affair with a colleague from his work, he spoke about his plans to get rid of his wife, he was running his real estate office at a loss, scamming the books, he told people he owned his house, but he was renting it, he told his mistress that his wife was the cause of all his troubles.. that is a non functioning person. If you mean , did he APPEAR to be functioning, that's a different matter. He appeared to be functioning to various clients, at various times.
Where as, this young bloke has no background that anyone knows anything about. .. in the high functioning personality disorder circus, he is , to all intents and purposes, an unknown entity. Except for the murder. Of a complete stranger.
Edited to add.. Gerard was so low functioning, the first copper he spoke with ,( he rang them to tell them his wife had 'disappeared' the young copper looked at his face, saw the scratches and immed. called his supervisor. Gerard was THE only suspect 5 hours after he murdered Allison)