You can't expect to guard the three when your entire back court lacks athleticism. Pressure the perimeter, and give up dribble-drive. Fall back to contain, and give up the three. I've been vocal about this for the last three seasons. Everybody could see it coming, but Fran just keeps bringing in wing player after wing player.
And, I have never understood all this talk about Moss being a good defender. He's not. Not even close. Moss is pretty good in transition and can hit the occasional three, but that's the sum total of his game. He only looks good in comparison to players like Ellingson, but my grandmother would look good defensively compared to him.
As far as the front court, the lack of development of the upperclassmen has hurt us. Wagner is essentially the same player he was the day he arrived, and Uhl has actually gone backwards. Other programs have players that get better and better each season (like, say, Penn State...). Here it's a rarity (Aaron White, Dev Marble, Jok and that's about it).