Why? Dude has played 3 years of games at the highest pre-NBA level. If he does something in a workout better than he did in games and you draft him on that, then you are likely making a mistake. If he doesn't do something as well in a workout than he did in games and you don't draft him because of that, then you are overemphasizing that deficiency. Either way, you are drafting him to play in games, not perform in workouts. Shockingly, games are going to be a better indicator of how he plays in games than workouts are.
Has there ever been a guy who improved his draft stock based solely on workouts relative to his game play who actually lived up to the increased expectations/pick? Those guys always crash and burn and end up being who we thought they were. If a guy isn't good in games then he is not going to magically become good in games simply because he did well in workouts.