He’s not really “young” though, he’s 26. By any metric he isn’t even a prospect anymore. By this point in most people’s careers, you are what you are.
Scotty P is a small offensive dman who needs to be sheltered a lot. He’s a playmaker who isn’t great at forechecking to gain possession, or resisting pressure from opposing forecheckers to maintain it. Which makes it hard to make plays. He can QB a power play probably, but he can’t be trusted to keep the puck in when there’s a scrum (or even minor pressure) at the blue line. He can’t do the little things that would enable his undeniable skills to translate at this level.
If he was more than that he would have shown it by now, even accounting for the injuries and the very late age he left college hockey. He’s outlasted two coaches here, and had nothing but runway to prove himself and take someone’s job. He hasn’t, and that very well may be because he just can’t.