Every time I look into the digger's transactions, he appears to be sending his CLAMs to poloniex. From there they mostly move to Just-Dice.

There's no way (short of attempting to gain inside knowledge from poloniex staff) that I can tell the difference between him simply withdrawing his deposited CLAMs from poloniex to Just-Dice and unrelated third parties buying his CLAMs on the poloniex market and withdrawing them to Just-Dice.

We have seen higher levels of trading on poloniex recently, which suggests that for the most part he is selling his CLAMs to JD investors. Then again maybe he's selling them to himself and investing them.

tl;dr: idk