Fien was brought to the club for his utility value. I don't think it was ever intended for him to be the 1st choice half. From all reports Kyle Stanley trained all pre-season as the halfback. Fien's well and truly in the veteran class now - I doubt that he'd be performing any better at another club regardless of coach - possibly not even playing 1st grade at most clubs.. The days of him being NZ halfback are well and truly behind him.
Soward was allowed to play to his strengths under Bennett - he was surrounded by ball players in Boyd, Hornby and Young which meant he could concentrate more on tactical kicking, a catch and pass game, together with the occasional broken field/opportunist type role. Unfortunately I don't think Jamie's strength is calling the shots or ball playing. It's just not his go.
There's no-one else in the side currently to absorb the limitations that our halves have. How another coach could solve that issue, without recruiting, is beyond me.