I played Puryear's WTC lists straight up. It is powerful into a broad swath of lists. First game was against Ossrum Irregulars with a bunch of heavies, second was into Kaelyssa with double Sentinels, double Hydra, and Banshee, and third was into Bradigus Bones. Of the three I probably wouldn't do Bradigus again, though I won that game. Deleting a heavy a turn from range stings.
Its not really that risky. He can be up to 10" behind the Colossal and still give it all the buffs/focus. Plus he can load the colossal and still camp 3 focus. Since he's not going to use Road to War with a colossal, and Mystic Wards is situational.
He is effectively def15 arm20, vs the first 3 damage rolls anyway.