I remember reading threads created maybe a year after satoshi was gone. There were people that didn't understand why the creator hadn't shown up for so long. The creator introduced himself as "Satoshi Nakamoto" but this name isn't weird. If he put a name like "Unknown X" or "Jeff Banklessman" we could understand that this isn't his real name.

We had to search this name in the entire world in order to convince ourselves that it's a pseudonym, and we only found a Dorian Nakamoto. I admit that Satoshi picked a nice name if he wanted to remain his anonymity. (and be serious at the same time)

Back to the question of the title, when did we find out it wasn't a thing at all? Who questioned those first?
Hey, where is @satoshi? Why isn't he online anymore? Does he hold many bitcoins? Who is Satoshi Nakamoto?

I've read that both theymos and Sirius hadn't any special contact with Satoshi. Sirius purchased the domain, helped by spreading bitcoin and theymos was later an admin on this place. (I believe that satoshi gave him the admin role)