Could it be a conditioning issue? Obviously a player would make more mistakes when he is fatigued.
His conditioning is great, plays more minutes then anyone else on Sarnia without a problem, his thing is that he never does the default easy play when he has no options, hates going off the glass and out or doing a dump and chase because he knows its just giving the puck to the other team, so he often tries difficult breakout passes, which is a great quality for a player at the junior level (especially when you're as good defensively as Chychrun) to be working on because he will be able to start doing the easy plays more without a problem when he hits the NHL, he is NO WHERE NEAR as bad as some people say he is when it comes to hockey IQ. He's clearly not as good of a breakout passer as say Juolevi or Fabbro but thats pretty much all they have on him
Only other thing he struggles at is when he skates the puck in too deep in the offensive zone, he doesn't seem to know what to do once he gets there, but for what he brings to a team i wouldn't care about this because it will only happen likely 2-4 times a game and it's still a player having possession while gaining the offensive zone which is always great
You can say his problem is he tries to do too much, but i'd rather teach a prospect to try and do less rather then trying to get him to do more
Chychrun will likely have alot of similar traits as Ryan Mcdonagh in my opinion but is a better skater, not great offensively but solid with a good shot (30-40 points), amazing defensively, physically, is a leader and does lots of things right