I don't think it's a coincidence that his better performances recently have came with Kiernan out the team.
Kiernan puts everybody around him under pressure when he's short with back passes to the keeper and just bad decision making in general.
That and he's not being forced to play it out on the deck, even under pressure, like Warburton had him doing. Time and a place for that, also a time and a place to just skelp it to fuck.