Frankly I had long made up my mind since I decided to give Aria the other medallion. I had my own trick, however having another wasn't something good right now as I didn't master my trick yet.
My fight with that swordsman had enlightened me about my future path, as I realized I still had a long way to upgrade my trick.
So instead of distracting myself over two tricks, it would be better to just focus on one right now, while giving the second one to someone who would need it.
So Rog was my best choice, although it was risky betting everything on him, I decided to give him the medallion and the secret class. I just saw how loyal and respectful he was to his friends.
Someone like him was worthy to have my full support and help, in the meantime my group would have two mystic art players, plus an ace assassin.