For me, Satoshi is not even lurking this forum on daily basis, but he's also posting around in different sections with a normal username.
He doesn't need to reveal "hey, i'm Satoshi, nice to meet you all".. i mean, he created all of this, if i was him, i would lurk and post around without any problem.
BTC is his son, he need to take care of him, watching him growing every day is the best thing possible.. holy shit, from an idea look where he is now, i would be super proud of this