You can change POW Algo from Zillionflux to 1GB-AES (Hodlcoin) and look at  ZgDyGeJJhmXwSroPasbTg3PVY9ohHUT8Xo. If he (or someone else) will gain similar dominance again, he have a CPU farm. If not - he have a GPU farm, because as i know, nobody had written gpuminer for hodlcoin since release. Anyway zillion flux is not resistant to GPU and you should change it to CPU-only algo. IMHO he have a GPU farm and had written cuda mner.