Yes Mdama is very anti human at this point, but I can see a act of kindness towards him such as a human saving his life might make him change his opinion on humans, if the Arbiter can convince him that humans can exist with Elites then that might end the Covenant civil war at the end of this trilogy, as I can't see 343 ending this saga in Halo 6 end and still have the Covenant in a state of civil war. I will be highly disappointed if the war ends simply with Mdama's death, he has been given a main character role in the books similar to the Arbiter in Halo 2 and doesn't deserve to die a villain. Also I'd like to point out that once you reach rank 50 in multiplayer that rank up emblem you unlock is the same hand symbol that is painted on Jul 'Mdama's armor, if you color it completely in white that is.