I avoid guessing. Pointing a finger at someone means that they have to spend the rest of their life worried that someone’s going to kidnap their family to get a ransom from a fortune that they don’t actually have. Also, whoever it was hasn’t caused any harm to the world, hasn’t even touched the balances under the control of their public keys, went through a lot of trouble to remain pseudonymous, and I don’t think that I should spend effort violating their desire for privacy.