If I would have cheated, I would have changed the price to 290+, don't you think?
It's impossible to tell. That is why it's logically indicated to exclude this possibility, we have the technology 
When I get some free time, I will want to interview the top 5 and the bottom 5 traders to understand how they got there...
Look back on the trade history. the bottom player has consistently bought high and sold much lower.
the top player has been making smart in and out trades, increasing his $$, then buying back in when he feels safe, like before a big pump.
Considering that 3th place is a several people tie in the $100 range, there will be a lot of interviews, including with some people that might be inactive or banned.
