Actually, I believe that the Rules only apply to angels. If archangels started bossing around mere mortels, then there would be no free will, we would be slaves.
Hmmm ... I can agree that "the Rules" Uriel was speaking of apply to angels, but does that mean there are no "Rules" that apply to humans? Remember, Kemmler also had "truck with demons," so this goes beyond just normal interactions governed by human rules.
I'd bet Uriel had the power to enforce the "Once you're dead, you
stay dead" with Kemmler if he wanted to/was allowed to. I don't see him being so willing to help Dresden if Dresden was Kemmler reborn.
Admittedly, it's all speculation (fun, but possibly useless). Like I said, I'm not buying ... yet.