Pirate's identity isn't known.
Pirate is one of the most well doxed people in all of Bitcoin: him, his wife, his boys, his business partners, his brothers, father, mother, address, phone numbers, pictures of all of them, pictures of him - which match the person we all met in person in Las Vegas.
Now what?
So why haven't you gone to find him in person to get back your "10,000 BTC investment"?