He wasn't hindered by MTL, that is a myth. He was playing 13/14 mins a game, sheltered assignments. Had a great RC year and decent playoff numbers in MTL.
His first year in CAR they him played less minutes, with worse players and here we are, he is struggling a bit in CAR and his last two games, 11 minutes.
MTL did sit him in the second Cup playoff run and that is where the myth of misused Jesperi comes from. And he showed us by going to CAR and breaking out in the playoffs with 9 points in 29 games, a third of those points in one game.
And while young, he has 350 NHL games, and doesn't appear to be improving much. Or maybe he is and Rod is hindering him.
His primary issue is he has cement legs and the league keeps getting faster.