Can't give an unbiased view because I have only seen Jack playing that position in the recent games. I have not seen Shaka or Ince play in a while.
For the game today, Jack pulled off a top notch save or as the commentator said "world class", in the last few seconds when the Bahrain guy cracked a shot from a turn around at the top of the box and it took a deflection. I think that Jack's reflexes are on point. However he seems to have problems judging the air balls as evident by that play in the first half when he totally missed judged a ball that came into the box. He was badly beaten and Dog had to head to safety at the last second to save a sure goal.