Well the brother appears to be more of a troublemaker, considering he's in jail in the first place (which I still find odd - why didn't they just pay someone off to take the fall), so scars/tats might be appropriate.
Even for a conversation behind glass? This is why I want to know about the set. If it's as we've been lead to believe, just a conversation with the brother (possibly as a distraction, as
Old dog I think was theorising), then all these scenarios about getting Sophia to remove her clothes are absurd. We already have a blackmail plot to get Sophia to wear sexy clothing, and to start flashing people with Aiden's tasks.
What we don't have, and what I suspect the casino plot is actually about considering it's ties to the Ellie route, is repairing the relationship between Liam and Sophia. Also the fact that there's no Filthy point required or gained. It's entirely possible to play the GW route with this casino plotline.