Well, I see the problem that they are not really fitting together. Size-related you have a PF, and two SF (potentially outside SF). In addition you have two Allstars and one Superstar. So, I would suggest to focus on the 18y old superstar and make a nice PF out of him. The others can "swim" with him a bit until they reach their skill targets.
Hell Ya - We are coming from the North to conquer your arena ...