No. I explained in the threads why I am confident he is not legitimate. Even if you accept his "World Cup" win as legitimate, he was never able to replicate that performance ever again. So maybe a lottery winner should also write books and do the seminar circuit?
And remember that the same year he "made" $1m in a trading contest, he lost over $6m of client money. Same year. Did you read that NFA finding? Keep in mind that time stamps on trades took longer in those days. Think about that. Now imagine having an "accommodating" broker.
And on the matter of brokers, Robbins Trading Company, the contest sponsor, promoted what would subsequently be "Managed Accounts by the World Cup Trading Team." So the winner(s) of the trading contest would go on to manage client money sourced by Robbins. Here's the thing. While the contest was still underway, Williams was already identified as one of the members of the World Cup Trading team. Williams's victory was taken for granted before the contest was even half over.
The NFA couldn't prove collusion but they made pains to advise possible investors to be aware of Williams's managed money losses while he simultaneously made money for himself. They also fined Williams and Robbins in connection with the contest, but it was appealed and a lesser charge was levied.
Seriously, how many red flags does it take?