I don't like this setup.
It simply require that all three of those dgs have to be together with Oak as Leader to be effective.
Good luck finding a good QoT. QoT with no blood, speed or cloak, that means she needs to hide behind. If I aim her, she is easy feed. And By aim, I mean she shield her ally, then I 2 hit her.
Also, this combo can easily be halted with an oculus. Or a DA and another damage dealer combo.
In my opinion, this is a cowards-wannabe-tank combo. <- That sounds mean, but it isn't.