Everyone knows 'follow the money'. It's a frequent plot in TV cop series, especially ones with corruption in their story.
There's the related point about knowing who suffers from an action but going on to discover who profits.
So adding the money man long-term Trump Organization CFO Allen Weisselberg to the list of Mueller investigation inputs is an interesting move. Weisselberg is said to have been given some immunity, but presumably only his interactions with Cohen. That's both Trumps long term lawyer and financial officer now being offered deals by prosecutors.
Cohen provided that tape saying how he'd used Weisselberg's advice about how to clean and insulate payments to the two women. It begs a question about how just how hypothetical Weisselberg's knowledge was?
In many TV-show stories of this type, a direct threat to the main man may be too difficult. They'll insteadgo for other family members. Maybe that could put a few interesting other people under a prosecution spotlight?
Weisselberg's history with Trump is continuous from the 1970s when he first worked for Fred Trump. Most recently he has has been handling the family business through the Trump Old Post Office LLC Trust, which has put Weisselberg and Donald Trump Jnr as the only two trustees of a mechanism to keep Trump away from his businesses whilst in office.
Famously the trust was also modified a few days after its press release. Eric Trump was removed as a trustee and a new piece was added which gave Donald Trump the right to take money from the trust at any time.
Labyrinthine situation? Hardly describes it.