Jack is to a tee a McDavid-lite clone
Their skating is their biggest asset while their vision/playmaking are insane and their shot isnt great but they pick their spots so well. Jack is perfectly built skill wise for todays game - he can end up a better skater than Connor minus the top speed
McDavid has 2-3 inches and nearly 30 pounds on Hughes which is one difference, its what helps McDavid be really good on the cycle on puck protection where as Hughes will have to adapt a more Barzal, Kane, Marner style of play which is more shiftiness and finding open ice than pushing off defenders deep in the offensive zone.
Also its definitely a misconception to say McDavid has a weak shot. Its actually really good. Over the past 3 years he is 5th in the NHL in goals. He is an elite goalscorer and hit shot is one of his weapons. Not as good as his playmaking/vision but still one of the best in the game.
It's really bold to claim Hughes will end up a better skater than McDavid who some consider the best skater to ever play in the NHL. What is your basis for thinking Hughes will be the better skater?
Overall I really don't think Hughes is that similar to McDavid, in fact I think the initial comparison to Barzal is pretty accurate. Barzal is much more focus on playmaking than goalscoring where as McDavid is at the top in both categories, the size is a big difference and the style of play is very different. McDavid plays more of a cycle game than a lot of skill guys. He's unbelievably good at coming out with the puck when he goes 1v1 into a corner or behind the net with a defenseman. He doesn't grind down and fight off defenders like Draisaitl or Crosby, but definitely more that style of play than Marner/Kane/Barzal which is who Hughes will likely emulate if/when he becomes a high level player.