Not as it concerns Tessa the reaper. I don't think Tessa "healed" Dean, I think she "undeathed" him. But because Dean had to live when he was dead, the natural order says that someone has do die if a person who was going to die is going to live - we learned that in the faith healer episode. So yellow-eyes "controls" death, like the preacher's wife "controls" death in that earlier epi.
I remember watching the Sam/CR demon epi a long time ago, I'd have to rewatch it to make sure I knew what I was talking about.