To piggyback off of what has already been said, his mind and how he thinks the game is elite, it’s why he has been able to come in at age 15/16 and put up point per game numbers. He is very deceptive with both his feet and posture and this causes defenders to think twice and their timing gets thrown off because of it…
Look at this goal here, he picks the puck off the wall from his teammate, head fakes to make the penalty killer believe it is going to the point, this gives himself the time and space needed to walk in, cause the defender in front of him to freeze up, thinking a shot is coming to the left only for him to use the defender as a screen and it allows him to do the Matthews/Bedard curl and shoot wrister that is getting more and more popular with kids these days.
Or on this play below - McKenna is anticipating a pass to the point if Calgary wins the loose puck battle in the corner, they do and do exactly what McKenna was hoping for - he misses the puck along the boards at first but strong stick and body positioning allows him to poke the puck off the stick of the defender on the point, past him and McKenna starts wheeling down the ice with the puck. He takes a look to his right and see’s one defender and one of his teammates - he realizes that the defender was going faster than his teammate so he slowed down, allowing for his teammate to catch-up where he set a pick on the defender and McKenna had an open, uncontested lane to the net where he found an opening on the goalie.
As for what he needs to work on, he isn’t the most engaged on the defensive side of the puck, like most 16 year olds he is always thinking offence. His IQ is fantastic so I suspect this won’t be an issue in the future, prospects as smart as him usually develop this part of the game as they mature.
He also needs to hit the gym, gain some muscle to become stronger on the puck. He is afraid of the corners like most skilled players and it’s something I’d like to see him improve on moving forward.
As for a player comparison? Dylan Larkin without the blazing speed.