So, we know RBC buying was all Sergey Yanchukov...at that time Anonymous (whoever that is) was selling. Now we see anonymous buying...who could anonymous be?

Definition of 'Anonymous Trading'
Bids and offers that are visible on the market but which do not reveal the identity of the bidder and seller. Anonymous trades allow high-profile investors to execute transactions without the scrutiny and speculation of the market. Anonymity is attractive to investors who want to complete large transactions without drawing attention to their trades, since such attention could impact market prices. The London Stock Exchange provides a platform that facilitates anonymous trading.