You are oversimplifying what it is like playing with those guys. Robertson is used to shooting at all chances and having the puck run through him at the OHL level. For the first time in his life, he will be asked to be the 3rd wheel on a line. In a vacuum, Kapanen, Kerfoot, and Johnsson are more skilled than Hyman, but Hyman plays an extremely simple game and works hard, which is why he clicks at the 3rd wheel. Neither Tavares or Matthews are going to enjoy playing next to Robertson unless he stops shooting any chance he gets. He's a very promising prospect, but there is no need to rush him. That's a major reason some stars in junior can't adapt to the NHL, its not they don't have the skill level, its that they can't adapt to being the 3rd wheel on a line. Matthews, Marner, Nylander, and Tavares all like to have the play run through them to an extent. Especially Marner. It might actually be easier for him to break in as a 3rd liner. But, I'd probably send him back to junior, especially if this likely weird off-season stops him from doing strength and skating training.