Looking at statistics only, Gavin Reed and Nines made an excellent team: without a single case unsolved since they've started working together three months ago, everything appeared great. But it only scratched the very surface of their relationship.
Looking at their dynamics, it became obvious how much room for growth both still had: getting along with the robocop Gavin was crushing on while feeling unable to stop the asshole-front constantly proved to be a serious issue. And Nines acting as the punching bag of said asshole didn't help. Turned out that expressing emotions properly was pretty damn difficult.