"The series of $1,000 days that brought BTC to a record above $19,600 could have been the work of one entity"
I'm very skeptical. It is certainly possible that a single entity may have encouraged the rally. But there is no way that a single entity actually moved the markets this much. The amount of cash required would be significant.
During this time, there were shops in Korean cities advertising cryptocurrency sales in their store windows. This was not entirely the work of a single whale.