There's been a lot of "what lies in the shadow of the statue" theories floating around on the blogs so I thought I'd share my own. (Probably too looked into, and wrong).
The two obvious possibilities to answer this "he who will save us all" Is Jacob (because he lives there) and Locke because he is actually outside in "the shadow" rather than in the statue itself and is dead, hence "lies"
But I wouldn't put it past LOST to simply make it a play on words and have the actual person be someone we'd never expect. So I thought that "what LIES in the shadow of the statue" could be someone who has done nothing but lie his whole life. Mr. Ben "lying-to-us" Linus. Just an odd thought I had. Probably not right.