One man can not do anything but the whole people that are intersted in bitcoins can.
I think it might have done if you have a lot of capital is certainly it will be easier you can change a lot of people or your team with a robot, although it will be tricky, I think the price manipulation would be much easier when you use help of robots
I don not get what you mean in your explanation, why would we need a robot to manipulate the price, I guess that is just on the technicalities that you are talking but in general only those who are holding a big percentage of the total circulation can manipulate the price of bitcoin.