I don’t think his initial trajectory was that unusual. He came into the league as a young rookie at 18 and was 34th in scoring, which would basically be PPG today, and showed signs of being the player he is today with a big playoff series. He experienced some growing pains the next couple years but was still a better player than he gets credit for. He was 66th among forwards in points per game over those three years, so he was at worst a good second liner. He made a huge jump in his 5th year but he was still only 22 and made some changes to his training and diet. While MacKinnon is a toolsy player who was pretty developed physically at 18, I think he had to still develop physically to fully play his power-speed combo game, which is something someone like Lindros didn’t have to to the same extent.
I think the unusual bit is taking him game to another level last year at 28. That’s unusual in general let alone for a player who was already one of the best in the game. I think it’s still tbd if it’s a true new level though, or just a spike year, which wouldn’t be all that weird. Kane’s spike Art Ross was at 27. While he is leading the league in point this year, I think it’s more in line with the rest of his prime. Visually he hasn’t been as good since a strong start, his pace is actually in line with 22-23, and his goals are down and secondary assists and empty net points are up.