Currently watching Mackinnon dominate the playoffs for a second straight year and it got me thinking about his relative "down years". After a very impressive rookie campaign, years 2-4 were relatively disappointing and it looked like he wouldn't reach the level many expected. Since then, in his years 5-8, he's become a superstar and arguably the 2nd best player in the league, and clearly the best playoff performer.
So what was up with the sub 60 point seasons from Mackinnon in years 2-4? Some players become stars later in their career (Marchand), but Mackinnon had a ridiculous amount of pre-draft hype, lived up to it in his rookie year, then went kind of quiet for a while before picking up on the trajectory he left off of. What happened/what changed to lead to his big break-out year/Hart finalist season in 2017-18? Was it something about the team that changed, or Mackinnon himself?