When Castiel said that Destiny can't be changed, I think he was talking more about the past; the past can't be changed. If you think about it, what happened was destined to happen because it happened. Remember that DarkAngel episode, with Brain. He said: "You know what are the chances of you and me, hiding behind this desk in a police department office, me with a sprang ankle, you dressed like this? %100. We're here, aren't we?" Not exact quotation but you remember that bit?? I think it's the same. The Past CAN'T be changed. It's the passed, it happened. It was destined to happen.
When he said: "You have to stop it", I think he was referring to YED's plan: Sam going to the dark side. This would be linked to his warning of: If you don't stop him, we will.
I like your Ruby-theory. Yeah, her mystery annoys me too, but I looooorve. I was SO happy that she's back. I'm still not confortable with Ruby 2.0; the new girl looks far too vulnerable to play ball-breaking, ass-kicking Ruby... *sigh* but, oh, well. It's what we get!
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When he said: "You have to stop it", I think he was referring to YED's plan: Sam going to the dark side. This would be linked to his warning of: If you don't stop him, we will.
I like your Ruby-theory. Yeah, her mystery annoys me too, but I looooorve. I was SO happy that she's back. I'm still not confortable with Ruby 2.0; the new girl looks far too vulnerable to play ball-breaking, ass-kicking Ruby... *sigh* but, oh, well. It's what we get!