I don’t think he will be that grunt inside mid either. Never did and don’t think the Dockers do either.He had an interrupted season, his form was solid after recovering from a foot injury. He's not a grunt inside mid, more a replacement for Cerra & Mundy. Can't find the video anymore but he did kick an 85 metre goal for Peel in his 25 disposal breakout game, he'll be fine in the long run.
Cerra is a good comparison. However Cerra in his under 18 year had some excellent contested ball percentages, something that MJ didn’t. And Cerras game at the top level is far from contested inside beast. But he can get his own ball when needed.
That’s the knock on MJ, and will ultimately determine whether he progresses to the level you expect him to. We didn’t see him improve this aspect in 2022 in the WAFL.