Even Theymos doesn't know the identity. He have helped through the forum. Even now he might be around the forum with some other name going through different discussion taking place about the future of bitcoin. Some might've participated on random discussions, but never thought of Satoshi being this genius. More users of his time weren't active on the forum.
we don't even Know theymos identity so who knows if he really know or not Satoshi? 
but of course no one will admit nor reveal if they truly knows the Great creator , this is the reason why those who pretend to be satoshi is obviously known as faker.Am I the only one who finds amussing the idea of satoshi using a Newbie account to participate in a discreet way and lurk to see if his beloved community is behaving and has evolved the way he wanted it to?