Did you look link? i dont think you know what you talking about, it is 100% a single buyer, was all bought at same time within 1 hour.
Yes I did, and looks like you are very smart and know everything so please tell us all what address he used for receiving 12000 Bitcoins and maybe you know his name and address also.
I do wonder if you look at the link I posted looking at much bigger picture showing that Coinbase is reducing Bitcoin supply 37.4K in January, 62.1K in February, 46.3K in March and 62.4K less so far in April.