Draco is secretly a creative spirit! And I do assume Draco's questioning of things with his father and the Dark Lord would make him less of a candidate and the death itself could fall on Ron's shoulders since he could be more valued than Ron, which would strike a nerve with Draco for sure, despite his own morals coming into question. I would love to see Ron go over that line of good v evil and actually take the shot but again, if Snape needed to do it, he still can. I just know/recall Snape doing it pretty much ensured Voldemort could kill Snape later on in the final battle at Hogwarts. :/

Oh me too, I need some HP grit and fluff~!