Full disclosure, I probably haven't watched enough games to evaluate Gregory's coaching ability. But simply from seeing the players we had, and knowing we lost close games. The guards were probably getting tired from not having a good big man. When your team is getting outrebounded, the guards have to put more energy off the ball, which can hurt their offensive output (especially late in the game).
These teams have talent again, which is something we have been missing for big chunk's of USF's basketball history, so in coach Gregory I trust. For now.