It is possible if we applied a Fast Forier Transform (FFT) to the data since $450 the pattern would be clear (clearer) through that time.
Backing-up the observation by strong math is of course the only way. However, I am not enabled to accomplish this at this time.
Not sure if I want to do it anyway. If we were able to "prove" this with some analysis then who knows how far that info would go. "Bitcoin Price Manipulation On Largest US Exchange" -> Crash.