You can make any stats look like that. I could say that Ben Miller has only kicked goals in 1 game if you ignore the St Kilda game.
Let me ask you a different question. If Jack isn't playing, who takes the best defender, and therefore who else will kick goals for us? We have relied on midfield recently as we haven't had our forward setups right.
I'm not saying that Jack doesn't appear to have some burnout (the bye came at the right time for him, just the problem was we were so poor on Thursday that he didn't stand a chance), but who else do we have that will be able to kick multiple goals.
Bauer we need to be on a weaker defender (surely you don't want to give him their best defender?), Miller (has kicked goals in 2 of 9 games this year)? Ryan? (not strong enough yet).
The facts are that we don't have a lot of options and Jack is still the best that we have to play that role, and we need to acknowledge that he won't kick as many goals. He was expected to play as a 2nd or even a 3rd forward this year, with Lynch's injury he is having to play a role that he maybe isn't well suited to play, but he is our best option at that role right now.