I can understand why you think like that.
For me he is a player who is at his best as a deep lying midfielder. And I still think its a shame he hasn't had a genuine chance to continue in that role. I still can't get his performance against Barcelona out of my mind.
http://www.youtube.com/watch?v=DP_pCG9Cmio
If you watch everything he does from that deep lying central midfield role, it is an astonishing performance. Totally complete performance. Shame he got injured and didn't get a chance to build on that performance in that role.
Having pace to be able to suddenly win the ball from a deep position and accelerate through the midfield from deep is a brilliant skill which only few people have. There are very few players who can be deep lying midfielders like that. Toni Kroos comes to mind even though he starts further forward, he always drops deep to play from there. Arteta is great at that, but even he doesn't have that ability to burst forward through like Jack does.
A player who played like that for Dortmund and Czech team was Rosicky. Mind you in Dortmund he played all over the park and there's a reason he was L'il Mozart. But for the Czech team when he was younger, the undisputed leader was Nedved. So Rosicky played as the deepest midfielder in a diamond. And despite being slight, he was brilliant. And it was his ability to control the ball, accelerate suddenly and reading of the game that allowed that.
I understand the frustration with Jack but I think if you watch that performance which was against three centre mids at the peak of their powers, there are very very very few players who could play like that in the game. And that's what I keep thinking gives me hope that he will develop.