
Been playing with him and this is my thoughts.
Defense: Killer instinct after it expires goes on cooldown for 6 seconds.
Offense: Cruelty: Buff potency 10%
Fury on sp1 and sp2 after killer instinct: Buff potency 25% and duration buffed from 6 seconds to 10 seconds.
This should help offensively and keep him pretty strong defensively.