At 6-foot-4 and still looking very young and underdeveloped physically, Sumner's upside seems to be off the charts. The talented combo guard has a lot of different tools to work with on the offensive end already, and as his body matures it should take his game to new heights.
Quick and crafty with the ball in his hands, Sumner has the flare and shake often seen in speedy combo guards that can break defenders down off the dribble. One of the big differences in Sumner's game though, is that he can really shoot it from the outside as well. While he may not be the big-time finisher at the rim that some of those other top combo guards are, he will not have to develop a jump-shot to add to his game, as he is already a high-level shot-maker.
He has sneaky height and athleticism. Usually, he'll go the finesse route, choosing to end his drives into the lane with a floater, pull-up or well-timed dump-off to an open teammate, but he's fearless and bouncy enough to keep the defense honest with the occasional impressive dunk. Not that he's bad now, but he'll likely improve his ability to finish significantly as he gets stronger.
The coaching staff seems to want to get back to utilizing the ball-screen offense, and the addition of Sumner will give them another weapon to do so. Keeping in mind that none of them have played in a college game yet, a backcourt rotation consisting of Sumner, Brandon Randolph and Myles Davis should give them three talented guards who can really score the basketball, and also make plays for their teammates. If Semaj Christon doesn't leave after his sophomore season, adding him into the mix for another year would give Xavier a very deep and talented group, particularly on the offensive end.
Defensively, he does a really good job of making plays. He'll obviously improve on this end of the floor as he gets stronger, but right now he uses his quickness and IQ to create transition opportunities with steals in the passing lanes or on the ball.
If you believe in the "momentum theory" in recruiting, this would certainly put the Musketeers on a roll in the 2014 class with a talented four-star forward in Melvin Swift already in the fold. Will the combination of the looks of a promising class and the move to the Big East be enough to reel in another top target? Who knows. But in a class where X could take one at just about any position, they already have a solid core, with a freak athlete four and a skilled combo guard with good upside. Expect the staff to recruit for at least two more spots, with wing Justin Bibbs and center Sean O' Mara being two prospects at the top of the wish list.