I don't disagree, obviously, but your post was far more 'woe is me' than 'these heat maps and disposal numbers are not at an acceptable standard.'
Jack has been thrown all around the field this year, and has demonstrated at least potential in the midfield and down back (I think he'll be a mid, but he needs to have the fitness to run far more than he does at the moment to get there) and Pickett's never had any form of continuity. He still actually looks injured - since he's returned to the side, sure he's laying tackles but I've not seen the pace that made him literally uncatchable last year - and he's playing forward pocket, which as far as I'm concerned is not his best position. He's a wing, and while 8 disposals 5 tackles is definitively not enough, if he can find some fitness to attack the next preseason properly then there is every chance he can improve on those numbers.
Le Bois hasn't had any run at it; when right amongst it for round 1, he does his hammy, then recovers, starts going okay and slowly building, then bam again. But injury alone is not sufficient reason to delist someone after two years (Gary Rohan, Nathan Freeman, Daniel Menzel etc) and he too needs to get through the next preseason with the aim to push his way into the ones for the season opener next year.