Playing when you're this badly hurt will stunt the development of yourself and your team by weeks at least.

You are hilariously overestimating the impact of a little bit of pain that keeps you from using proper shooting form. Also, you're severely underestimating the role and difficulty of developing a player's mental understanding of floor positioning, speed, timing, and offensive/defensive sets. Every broken minute puts a player closer now matter how much they have to "unlearn."

Even though there's literally no way to quantify either position, it's a lot easier to make an empirical measurement of the things he will pick up during NBA minutes just by quizzing him on positioning and offensive sets before/after. Might as well treat his shoulder with homeopathy if you really believe intangible junk like stunted rhythm/team-cohesiveness development matter more than having a mental understanding of the game and a realistic perception of its speed. All this 'unlearning' that you think would be required is a total fantasy. He's a human being. When we pick up a new tool, we put down the old one and start using the new one. There's instant improvement and a head start on a ton of stuff that would have been impossible to learn before buying that fancy new drill.