He was still one of the two main founders and married to the other main founder. He wasn't totally uninvolved with the company.
He still did Office Hours, at least for a time. He described that as "ten percent of what he did" and hired at least two people to divide up the other 90 percent.
I imagine he and Livingston discussed the company over breakfast/dinner and a lot of decisions were likely joint decisions privately hashed out. It's a company founded by a dating couple who later married. There is probably no clear, bright dividing line between "her" decisions and "his."
Well, if you want to read it tendentiously, I guess your choices are the buck stopping with Jessica, with Paul, or with Jessica and Paul. Seems straightforward to reason about.