As our deepest forward, Jack's output is only as good as our midfield's. When we are getting smashed like we did in the guts and going forward with no system or confidence then he will not kick goals.
As soon as the dons took the foot of the gas in the last and our mids were able to hit a stuffing target, Jack started kicking goals.
Maybe, if he was was champ CHF (he is only a v.good full forward IMO), then he could impose himself on a contest like this, but he aint.
Jack is not the problem right now.