As the question suggests, should Jack retain his captaincy? Personally, I think Jack is a good player, his progression has clearly stalled but theres still a player there. He is, however, not captain material imo. If you think it should be someone other than Shinnie, feel free to add.
Some interesting stats from The Sheep on Fire on Fezbook:
Goals scored under Jack's captaincy:
6
Goals scored under Shinnie's captaincy:
22
Goals conceded under Jack's captaincy:
4
Goals conceded under Shinnie's captaincy:
10
Does the pressure of the captaincy get to him? Much like it clearly got to Reynolds before he became super shit - or is it purely down to orders and tactics?