Kinessa's reload is fairly long, letting Maeve pitch damage in for free while you're reloading. If she's the only flank around and your team has other offense items covered, you could grab Deft Hands to help out an engagement.
It is possible to stun him and kill him in ancient rage. So any crowd control ability can pin him allowing you to either move away or let the team focus damage on him.
If you are in a area with good cover you can flank him with rocket boots. A few close shots send him into critical. This is especially useful If he has attacked some one else with plant.