Sell as fast as possible the first one.
Second one, can maybe be usefull.
Third one, is worth to train 1 or 2 more seasons to fill his biggest holes.
The third one, I would play as SF. He should be able to score a lot of points with an inside offense.
Make a plan what you want to do after your best trainee is finished. Start another training project? Than sell him. Start to compete than get complemantary players around him.
Only in the dark, we succeed!