IMO your logic still doesn't fly--sorry we'll have to disagree. I understand your point and your further explanation but just because Bobby died and was slightly more significant(and that's debatable) than Cas doesn't mean therefore they need to kill Cas too. And why they have kept Cas is only a guess on your part. IMO most fans like Sam, Dean, Cas and the late Bobby--not just a small group.
And i'd submit ultimately the writers disagree with you saying Cas is just a plot point and keep him because they think the character is an important part of the show and works well with their story. Otherwise he'd be gone. With the future neither of us knows the intent of Carver but my vibe is Cas survives Purgatory. And is it your guess, Cas dies? I kinda suspect you may think he survives too.
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