I thought it is established by now Paul Le Roux is almost certainly Satoshi. He had the motivation (money laundering), the cryptography knowledge and him never moving his coins after they became quite valuable is easily explained by the fact he is in prison. As far as I am aware there is no one else for whom all three would be present.
Whoever Satoshi Nakamoto is, once he (she?) moves the coins they become the target of lots of criminal enterprises. Those bitcoins make them a VERY rich person and draws a very bright target on their back. Maybe they just prefer not having to deal with this?
I remember reading the article proposing this and I seem to remember some pretty big differences in coding style (TrueCrypt vs. Bitcoin) and assumed development platform. I'm not convinced tbh
