Ask him/her/them:
Did you ...
I would like to ask him these questions, first if he still has control and access to over 1 million bitcoins.
Second, if he has it, does he have plans to sell it?
The biggest question is what he plans on doing with the 1 million bitcoins he mined at the start and what he thinks of all the bitcoin forks.
They are all gone, lets be honest if someone can access 11 Billion dollars and doesn't spend a cent, somethings up. I am 100% under the conclusion he deleted all of his private keys.
It would be very fair to get some information on these issues.
Or it's going to be a 'winner takes it all' game.