I think using Grandmaster could be argued as skilful as LK or Scorp because of the non-linear nature of making the Clone work, and slightly harder execution, but I think Cryomancer is much easier. In fact, he's the simplest character in the game, with the easiest combos. That being said, it doesn't matter, if you love Sub and this variation go for it, he's good to get comfortable with things and has his own strengths