In theory, it's totally possible but in practice, I think you're just dreaming. And IF it happens to be sure there are some people and media who will jump on to say it is confirmed there is a market manipulation with all kind of conspiracy theories.
The recent days are showing us all the weak hands who panic and sell their coins.
In fact, with the way the OP put it, one would think of a possibility of something like that but one thing I have known about all these finance dudes is that they are always strategic in their dealings and highly manipulative for their own gains which makes me believe that even Warren will not just come up one morning and buy everything at once to move the price upward but would rather keep accumulating until he is able to get a huge ground and position in the market during accumulation first which is how I believe whales play their card.