Unlike the other faction higher-ups who seem to have a callous disregard for the well-being of the native people, Greaves shows remorse for actions that, while necessary to wage war, harm innocent civilians.
However, Greaves still panders to the player's role as a mercenary, paying out in standard rough diamonds.
Act II: After his superior, Prosper Kouassi, is killed, Greaves runs to Bowa-Seko and becomes right-hand man to Oliver Tambossa, head of the APR. The two brief the player on faction missions at the APR HQ in Port Selao.
Act III: Even if you choose not to kill him, like all other potential faction leaders he is killed at the end of Act III in the Jungle Bivouac.