No kidding about being online - they're holding back on us!
But yes Faunus does make a point that Starkiller did have "formal" training. He was tutored under Vader. Vader could have killed him on the spot when he killed Starkiller's father, but recognized his potential. He just didn't know how much power he had.
But back to Kas'im, I do think Starkiller/Galen Marek could outfight and overpower Kas'im due to his training.