There are working price strategies that can be used to keep the spot price of Bitcoin depressed while all this accumulation is going on. I have mentioned it many times before but the idea is for a large entity to be buying X coins on the OTC markets and then selling a percentage of those coins on the retail markets as they continue to buy. I used to consider this a theory. But at this point I believe it is an inevitability.
I believe this is almost certainly going on. Given that the OTC purchasers have certainly negotiated a discount on the market price, it's the logical thing to do.