It starts and stops with coaching, when we get right down to it. Fran has recruited a bunch of players that aren't quick enough to guard their BIG counterparts. Because they can score on the offensive end, he allows them to play major minutes. This breeds laziness on the defensive end, from the whole team. And Fran has allowed that to happen with no consequences by way of lack of playing time.
You have 2 types of problems that lead to the same result.
1). Lack of athleticism = get beat on defense.
2). Lack of effort = get beat on defense.
How does Fran cut the minutes of the players in category 2, while allowing the players in category 1 to keep playing? Especially when I've personally seen some players from category 1, give category 2 effort.
All of the players sitting in these film sessions, see players from both categories get beat on defense. How can Fran allow 1 group to play, while berating the other group and expect to keep his credibility with the team?