ONLY reason to start Jack is because he meshes with Hedo better. And thats a major factor, considering how useless Hedo is without the ball.
He is not better than Jose, but he is solid, cut down his TOs and dribbles well. Recognizes fast breaks also. I doubt Weems could prosper under Calderon.
So yes, start Jack but don't trade Jose. Banks is being showcased and he now has less negative trade value.