Shiv could not get it for herself so she stopped Ken out of spite while Roman was a mess anyway so she saw the only path forward with Tom as his supplicant wife/mother to their child as he has some power for a while and Matsson will only blow it all up anyway and ditch Tom down the line.So I had the right idea and the wrong patsy!
It wasn't bad as an ending. I wasn't overly convinced by Shiv's last move though tbh.
That and her "Daddy" issues.