I might Recant

In one of those pieces on Granger's site he brings up the "stoppered death" theory, which I had not heard as an argument for Snape being primarily good (I have to look again and see where he got it, I think it was from some girls on a Barnes and Noble discussion board he is a monitor for). Basically that Dumbledore was already dying from removing the ring horcrux and Snape had been keeping him alive all year with the potions he brags about in Philosophers Stone (Granger notes that there are 7 references, direct or indirect, to that PS scene in HBP), and that the killing on the roof has been agreed upon as possible contingency ... that Snape bring about the inevitable sooner rather than later to keep up certain appearances. I still have doubts and questions, but this is the first theory thus far that I have heard that makes sense to me even as a possibility. Some were saying, "Maybe Dumbledore and Snape had an unbreakable vow on Snape killing him" and I though "WHO would you get to be the third party with the wand on that one?" ... I better watch it, I may have to eat humble pie on that if it winds up having been true somehow. (lol)