Honestly I don't know for sure if it is possible but I think there are a couple reasons it wouldn't work.

1- he would destroy the value in the BTC he holds

2- trying to corner a market like that is always a moving target. As you buy gold, silver or hash power or whatever the price increases at a rate that you can't keep up with.

This is of course assuming he was a bad actor but I don't think he is otherwise he wouldn't have invented it in the first place.