While the other whales all died and there is only one at the market at one time right? Don't imagine too many things, sometimes a 200 BTC buy is just a guy who wanted to buy 200 BTC, and a 200 BTC wall is just another guy who wanted to take some profit. You need some more solid data before it becomes anything other than some overly obsessive observations.
Really, when you stare at the price ticks too long you see demons in there which exist only in your mind; this happens to truckers, captains, stock traders and other people who stare at one point for too long.