Zader Comp Question - Gamorrean Guard?

For those who have tried this, and I'm sure there are a few, does Guard fit into a Zader comp well? If you consider a Zader, Zidious, Shaman, Boba and Guard comp, what are the potential downsides? Guard's taunt is on a very long cooldown but he has reliable DOTs and you can keep him alive with Shaman heals and his own protection regen.

To clarify, this is not for arena but for Raid.