I don't understand the point - why would you want the DK to pull something close to a caster? The main issue in 5v5 is people standing on top of you and circling around, and not being able to get good range.

The other thing is I'm just not sure about 5 dps. Elemental shaman get gibbed almost as easily as boomkins. They're just going to explode while your nuke target has pain suppression, earth shield, anti magic shell, ice block, divine sacrifice, and god knows what else on them.