Sarah and Aiden listened to Mia and Hunter talking, they asked questions and requested additional documentation. It looked more like a job interview.
In truth, Sarah and Aiden could use their Sigma and Omega skills (and Eve) to find out whatever they wanted on their own, but this was a way to gauge Mia's and Hunter's personalities. If the duo from Seattle was bending the truth or concealing crucial things, it would be proof that they are not sincere.
After that stage was completed, it was Mia's and Hunter's turn to ask questions, and Sarah and Aiden responded how much they could, without disclosing sensitive information.
Sarah, Aiden, Mia, and Hunter understood that if they agree to collaborate, this will be only the first step in the long process where they will be scrutinizing each other in a sensitive game of give-and-take that will cause their bonds to grow or shrink based on the outcomes achieved.