Maybe it would be too obvious..that it's the key. I dunno. I just think that the way the room just was never mentioned again, it sorta has to come back.

And Clark's reaction. As much as I don't want it, it has to happen.

Actually, I think Clark is in denial more than anything else. In Talisman, Lex told him downright, that he knows who Clark is, what Clark is, it seemed to me he was dressing him in the end. As if he knows his role and Clarks role and understands it far better.

Clark should know by know that there are no secrets left.

So yeah...he needs to see things more clearly.