Ah thus putting Juliet in further jeopardy... I am still suspicious of that thing with Juliet, did she really want 'a change' and for Jack to kill Ben? Or is that part of Ben's plan. I tend to think everything every single one of those Others do is all part of a huge grand Ben plan. Having Juliet 'want' to do away with Ben would make Jack see her as an ally and he would accept without question that Ben and the Others left her behind. And then they have an inside person to spy on pregnant women since Ethan couldn't get it done. But then there's the whole sub thing.
Why else tell Locke his plan...maybe to see if Locke is still loyal to the Losties? Although he seems to know what Locke is going to do before Locke does.
And Richard Alpert giving John Sawyer's file... totally part of Ben's plan somehow, I think Richard is his most trusted Other. Ben wants Locke for some reason, but can't just make it that easy, makes him kill his dad, can't do it, has Richard tell him how to cheat, now Locke can follow the trail they left... I need a nap now.