Garrett is a low level baseball "project". He's not leaving. He was drafted in like the 60th round( i'm guessing). Unless he's a Mike Piazza, I wouldn't espect Amir's path to the Majors accelerate anytime soon...but what do i know.
to answer the question posted, i think Pointer will be most improved. Tremendous athlete, probably best on the team, that the staff needs to work on the basics with. Handle, 10-15 foot pull up J, and passing.