I don't think the coma thing would work, because the Mark has a will of its own, as Death said, and it wants to be sated. Just like it brought Dean back from the dead, just like it basically defended him anytime he was in danger of being killed after that, it would probably just bring anyone who had it who was in a coma, OUT of the coma and back to consciousness, and then THEY'D be the killing machine. :/
ETA: Oh, and I'm not even a little tiny bit convinced that Cain is actually dead. Yeah, Dean killed him, but what happened after that? The Mark probably brought HIM back too, and we'll probably see him again. :P
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ETA: Oh, and I'm not even a little tiny bit convinced that Cain is actually dead. Yeah, Dean killed him, but what happened after that? The Mark probably brought HIM back too, and we'll probably see him again. :P
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