Why does it matter to you, what a random internet user thinks? Would you try to convince me of your opinion, if I say yes?
That's what this forum is all about.
OK. Then let's start. I 'still' think, this is some kind of a money laundering scheme. The guy(s) who got the 310BTC can easily say 'I won it' when beeing asked by his gov where the money came from. Maybe lottery/puzzle winnings are free of tax in the country of OP, while trading winnings are taxable for example. Or maybe OP has scammed/stolen money, which has to be turned into legal money.
This is way more possible, than 'a rich guy who wants to give 2 Mio $ to a guy who is at least as smart as himself'