Jack put himself in bad positions to get muscled off the puck, hit and potentially hurt. That's why he had a bad first year. He learned from that and doesn't put himself in those positions anymore. But the controlled neutral zone play was far superior than anything Lafreniere did during his first year, unless you go by points.
I think we need to stop comparing the success Jack had to Lafreniere not having the same opportunity/chances, etc. Jack showed elite puck carrying ability in his first year.