We know Korath from Guardians of the Galaxy, he is the leader of the group of Kree in the opening that fight Star Lord for the orb. In the film he also appears to be a "high up" Kree member for Ronan's forces.
However, watching Captain Marvel last night he shows up in Yon-Rogg's squad in the Starforce.
Why did Korath leave the Starforce and how did he end up with Ronan?
I am mainly looking for answers from the MCU canon including interviews from the writers and directors but lacking any information there answers from the comics are fine too.