As it stands now, if you throw Resurgence out, and then use Innervate, instead of DI x2, you end up with your player that was at 10%, now at ~50%, and you are back at square one.
Start with Resurgence, to DI, then innervate, and your target comes a hell of a lot closer to full.
A good test of this, is Nightmare Bonethrasher (the Rancor in KP) where at LEAST one person will be taken to under 20% life each swipe he does.