I know alot of you are shoe junkies. Some players have there own signature shoes. Lebron has his but the can only be used for him. They dont have to be unlocked, just changed. Vince Carter has his new shox, but only for him unless there is some kind of cheat.
Players with say a Nike shoe contract in real life will only be able to wear nikes. Same with reebok and adidas.
Nike and jordan shoes are the only shoes unlockable.
If you have any questions just ask.