I thought the idea was:
He comes in and says "sorry to hear about your son/grandson? being murdered" then proceeds to go ghostbust. Implication being, the granny/mom might not/probably didn't have any idea the ghost is her son.
We know that he was gonna spook the ghost out of the house, because that's his gig. He's goes in there and the ghost says something to the effect of 'I'm trying to get my mother to come up here and find this money' so he says 'tell me where it is so you can go' (whatever he said, the transcripts aren't up yet), so he takes the money and he steals it, gives her a slight cut and calls it a refund. When he walked downstairs, he was in a hurry to get the fuck out, was he not? The ghost might not have thought he was gonna keep ?I only saw it once.
I think the point was to show that he was a psychic and a crook.
At the least, a dubious guy.
I dunno, I just read an episode review that had some 'quotes', although they may have been paraphrased as well, I could be pretty off base. Whatever it was, I was well sick of backstories by Season 4, now here comes more.
Give me flash forwards, you sunsabitches!!!!
I also agree that they need to sharpen the script to the point where obvious questions and statements don't just go casually unasked or unsaid.