I think he took advantage of the situation, knew Liam was Sophia's husband.Without going too far with the extreme speculations (like Liam being already a regular of the casino etc that has been discussed) it do think too that his loss was not completely accidental. I mean losing at the casino is obviously the norm but them letting him get into such high stake gambling without being a well known wealthy or VIP player seems strange. That's why it's not impossible that getting him in debt for a sum he could not afford was a way to get Sophia involved. The fact that Don Morello called Sophia the first time was another possible clue. So there could be another development there if the Morello's card is played on Aiden.
Agree, we will have to choose, Sophia will "have fun" with the younger ones(Aiden) or the older ones(Morello)But I'm afraid that we cannot have both (Aiden and Morello) in that case.
The ugly part is, in both cases, without Liam's knowledge