To my eye he has very good positioning in the offensive zone and is good at finding the right spots. In addition he has possesed a good finishing skillset(both in the scoring and assisting departments) compared to his peers. I think you can already see that advantage has gotten smaller. I would also say that while he is to this day not very strong on the puck, he still has had the advantage of size and reach compared to his comparables. But yeah, on a junior level I think he is good at finding the right spot and from there be clinical. But I don't think it's hard to see why he has fallen further and further behind someone like Frondell, even though I would not be surprised if he has scored more in juniors to this day.
Respect your opinion, but I think we might disagree on both on his upside and on how hard/likely it is that he is going to overcome his weaknesses. Even if his compete, skating and strength improves I don't really know if he has much more than at best a complimentary player in him at the NHL level, his entire playstyle is so not about driving play or making things happen, or be a difference maker outside of at the very end of the play. There are so many players that are better who also can do that. To me there is so much in multiple areas that needs to improve. I feel like there are more interesting players, many of whom probably will believe available whenever he gets picked.