Does Locke recognise Richard?
When Richard handed Locke Sawyer's file and helped the Locke's dad get killed, was Richard helping Locke realize his full potential? Cabin Fever shows they knew who Locke was all along.

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Lostopoly.com

I did think it was weird that Locke never said hey, I remember you!

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" I push this button every 108 minutes, I don't get out much."

"Theres a time for living low down, theres a time for getting high. A time for peace, a time for fire. A time to live, a time to die."

The real art of conversation is not only to say the right thing at the right time, but also to leave unsaid the wrong thing at the tempting moment.

Do you remember people you met for 5 minutes when you were 16 ?!? I sure don't.

Not trying to nitpick, but Locke was much younger than 16 when he met Richard Alpert. I'd say he was between 5-7.

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" We kinda like knew that forever ago." -Hurley SE4EP8

That's true! When I look at pictures from when I was little - I don't remember a lot of the kids who are in the pictures. And those kids and I were friends, we went to school together, played together, etc.... I'm with Asher and Darnzy on this one - I don't think John would remember Alpert.

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`Dear, dear! How queer everything is to-day! And yesterday things went on just as usual. I wonder if I've been changed in the night? Let me think: was I the same when I got up this morning? I almost think I can remember feeling a little different. But if I'm not the same, the next question is, Who in the world am I? Ah, that's the great puzzle!'

-- Alice, from “Alice’s Adventure’s in Wonderland”

Also the mind has a filtering mechanism for things that don't make sense. How could Alpert still look the same after all these years? He may look familiar, but you would search your memory banks for people you knew who were his age, not some adult you met as a child.

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sometimes Locke doesn't tell everything that he knows. as ben doesnt
maybe he recognized Richard, maybe not. we'll know sooner or later... or maybe we wont. hahahaha

I have a theory that perhaps when we see Richard now, it's in the present. Like Richard believes Locke is the only way to stop the freighters and was trying to coach Locke into knowing his destiny young, so he leaves the island at coordinates to bring him to those times in Lockes life. But after dumbass Locke failed to follow his true direction, which would have gotten him the island in High School, he wanted to be a hero, or cool, or whatever, and I believe Richard gave up on him.

Think about it, it's Abaddon who tells Lock of the walkabout, and after the locker incident, we hear nothing more of Richard and Mittelos, nothing, until Locke is what, 50? ... and crippled. AND, it's Abaddon, who also has Naomi bring along the scientists clearly on a seek and destroy mission. Is Abaddon helping Ben and the Others, or sabotaging them. I guess helping, knowing that perhaps Frank is the only one who could land a chopper, and figuring Naomi might crash with the mercanaries... But then Abaddon is asking Hurley about the island, like now he has no connection. Odd.