Because Kalinda has been, at least until Nick entered the picture, such a compelling character, Cary has sort of been in the background. Now the spotlight is on him, at least in terms of his relationship with Alicia.
They travel to Washington D.C. together on a case of alleged indecent conduct on television by a comic played by Christine Ricci. Cary and Alicia, as you recall, were competing for the same long-term associate slot in a lousy market. Alicia won. Cary was not happy but lucked out landing a job in her husband Peter's office. Then he lost that through an error of judgment and lucked out again by being rehired by Diane.
Past history shows that Cary and Alicia have excellent synergy when working cases together. So, both recognize that it's in their professional self interest to smooth out the edges in their relationship.
But also there seems to be something to be gained for both of them to develop a closer personal relationship. After all, both are wounded and healing. We find out more about Cary's specific wound.
For years he has been estranged from his father. His father contacted him and we are all waiting to find out if there will be a positive development. Instead, it has the making of tragedy. Cary's father asks for a handout.
This horrific development indicates that the focus will be a lot more on Cary in coming episodes.