Not "someone", but the big talkers, the loud mouths on this forum. Since the zk announcement, pookie and longandshort disappeared along with another few aggressive ones. They are steadily dumping.
They appeared only when they thought there will be big gains for them trashing everything in their path and hurting shadow in the process. Zk implementation didn't rise the price for one reason or another so they are dumping.  But that's good. This gives the chance to other traders to buy SDC and leads to fair distribution. Once these loud mouths - big holders are gone, only then Shadow will prosper. Shadow needs traders and newcomers.
My respects to all the other members/traders.