MD played PG when he was younger. He has a great understanding of the game and knows how to read the floor. He does not "think" about who to pass the ball to, he knows who to pass the ball to. Now that he is adding his aggressive game around the rim, he makes himself that much more valuable. Most big guys cannot dribble, Marek can go coast to coast. He knows to fill in the flanks, rather, to take advantage of opportunities and JB seems to encourage it.
I would like to seek him add weight, especially if he wants to go pro, but he certainly has talent.