Don't agree with this. Jack lacked elite talent in the context of the modern game. Great leader, great person, bad kick, slowish, poor decision maker, and as someone rightly mentioned the combination of this had a compounding effect, where Jack being slowish brought more pressure on his kicking and decision making (and options) in open play.
I was criticised over the past 4 or 5 years over at 'ology for being critical of Jack, the player, but I've maintained all through that period that we wouldn't play finals with Grimes in the team. He lacked an elite attribute physiologically. I don't think he'd excel if he came into the team as an 18 yo now, moreover, if he was at Geelong and Hawthorn during their golden eras, he wouldn't have played 100 games. Our most exciting talent either has power, skill or both. Think Hunt, Petracca, Oliver (wow) these guys all have elite attributes. Hunt ridiculous speed, Petracca power and x factor and Oliver with best hands at the club.
Put Jack Grimes' brain, passion and approach into Colin Sylvia's head. You'd have a player there!