I really wanted JJP when he was drafted, but I just don't think he is a game changing winger. By that I mean someone like a prime Kane, Ovie, Kucherov. Someone who can control and drive a line on a championship team. Usually there are like 5 of these at best in the NHL at a time.
The Wings upcoming center depth is horrid. We have 1 legit C prospect in Danielson. We have Larkin who will be 29 entering this season, who I could easily see having to convert to wing by say age 32 as his skating falls off some. He already plays an wingers offensive game, but his speed and faceoff ability put him in the center role. The minute he can no longer use his speed as a puck transporter he won't be a super effective center. Assuming Kasper can at least be a 2C, we are probably going to need another top 6 center sooner rather than later.
Teams without center depth don't win, and our prospect depth at skilled winger projects a lot better with Buch, Ammo, Becher, Kiiskanen, Plante (maybe a C), Finnie, Soderblom.
Its less about Danielson the prospect and more about the hole trading him creates in our depth. This is where I wish Yzerman had taken a few more skilled center shots in the latter rounds early in his tenure.