My favorite talking point for players that struggle (Like Wiggins) is the "hidden numbers" and "the things that don't show up on the stat sheet" talking point.
Wiggins' numbers are pretty good, and he's within striking distance of KU's all-time scoring record for a freshman.
Raw stats:
Wiggins - 16 ppg, 5.9 rpg, 1.6 apg, 1.0 spg, 43.5% fg, 34.9% 3pt, 74.8% ft
Foster - 15 ppg, 3.7 rpg, 2.1 apg, 0.6 spg, 42.7% fg, 38.8% 3pt, 70.2% ft