I agree with Iwen. Summers and Palmer are very Capable with the rotation he specified- Pressure, then Outside Shooting, then One on One for this season (with FT or Stamina on the ASB and Offseason), and then next season rotate Pressure, Jump Shot, and Passing.
Freddy Diaz is also capable to be trained to be better than Patrice Sénéchal in that same rotation; he's not that capable at the moment, but after getting his outside defense to respectable/strong, he'll be much better. His inside shot and Rebounding, however, make him too weak at the Small Forward Position.
Rotate Diaz, Summers, and Palmer at the Shooting Guard and Point Guard positions and train them in the roatation Iwen mentioned, and they'll be much better than Senechal by the time they reach his age.