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So I'm thinking the reason behind Locke sending Richard to go talk to his past self is because he's seen timecop and knows he'd blow up if he came into contact with his past self. Also I think that Jacob doesn't really exist and he isn't going to kill him persay but the myth of Jacob. I know in a previous episode he has seen him but I think that is due to the fact he wanted to see him much in the way a placebo works your mind wants something to happen so it make you believe it has.