Volunteering Law for the task of killing Zompano. Not only is he durable, but his abilities will allow him to counter some of the Count's telekinesis, and well, like Marco he is a Haki user. As a subconscious side effect, the real Law has an extreme hatred of being mind controlled which will rise through to the AU version to a degree should Zompano choose to taunt the good doctor a little about what he's done.

And who doesn't want to taunt him? Do no harm, right. There's no risk of him getting... a little murderous.

I'm sure the Count has words for one of those who were on on the mission to the Keep, after all.