Both came in their 19 years old season... youre kicking a can down the street here.
Pettersson was 19 for 1 month this year. This was his 20 year old season. Even then, he still played over 2:30 minutes less/Game than Bo Horvat.
Barzal's was laready 20 when his Calder winning season started. Even then he was third in TOI/Game for C's on that team, behind Tavares and Josh Bailey.