Ghost will always be limited by his size, he's 10-15 lbs lighter than Kimmo, which means he's not going to be able to use leverage like Kimmo, and I don't think he can add much mass without slowing down.
So on defense, he really has to be a technician to be effective, and not surprisingly, coming out of college where he could just rely on his superior speed and quickness, he's far from polished.
However, even in a couple years, if he focuses on playing "the right way," being more conservative in his own zone, better understanding of angles instead of just relying on pursuit speed, etc., he's always going to be somewhat limited defensively by his size. Provorov has a great base that allows him to ride big forwards out of plays, Ghost just can't do that.
This is the difference between Ghost and Sanheim, when Sanheim grows up he'll be 6'4 210-215 lbs with a very long reach, on defense that will allow him to do things Ghost can only dream of, riding guys out of the crease, a stick checking radius that's absurd, etc., to go with the speed and offensive skills.
