How was it that Kay was happy to enjoy the spoils of the unholy and evil Sicilian thing for five years, the time frame for legitimacy
I don't think that Kay is just a passive party here - she likes that Michael is the alpha male and that she's the one sleeping he's sleeping with. You always have to go back to the bandleader story - she likes that excitement.
2. At the senate hearing, judging from Kay's reaction in the background, she probably figured out – made the connection when Michael suddenly disappeared - that Michael was personally responsible for the murder of McCluskey and Sollozzo
As the novel implies, Kay had made the connection herself (or had it made by the police), and then let Michael talk her out of it. I think any reaction in the hearing is more "...they're going back to
that?" than "I can't believe that was him."
