This is an excample of an allstar that are not even close to reaching the soft cap, and not the best weighted player.
This is an example of a SG that did reach his soft cap...
Weekly salary: $ 59 234 
DMI: 346200 
Age: 22 
Height: 6'2" / 188 cm 
Potential: allstar 
Game Shape: strong  
Jump Shot: tremendous  Jump Range: prominent  
Outside Def.: prodigious  Handling: prominent  
Driving: sensational  Passing: respectable  
Inside Shot: inept  Inside Def.: average  
Rebounding: mediocre  Shot Blocking: mediocre  
Stamina: average  Free Throw: strong   
The only thing I would have liked is probably 2 or 3 pops in IS and passing (which if I had patience before switching to talls I could probably get). Other than that, this is an allstar player that is pretty much the backbone of my team. I believe potential is relivant to the player you wish to create. There is no point in wanting a  hall of famer with the intent of training to a $30k salary.