Ultimately it's the manager who picks the team, sets them out and tells them how to play. I'm assuming that the chairman has no influence on team matters. We have a manager who insists on playing a high line, high pressure style of play. He has been backed (to a degree) in the market and he has to have some say in the players coming and going.
You say he hasn't been backed, but he has received the best part of £100 million in players over the last two summers. We may have recouped pretty much all of that in sales, but he has had players bought for him. If these are not his targets or players he wants, then he has no business saying that he is happy with his squad.
Let's not forget that it won't be Levy's choice to freeze out a £100,000 per week earning striker either.
I'm no Levy apologist, I respect what Enic have done since their arrival and the transformation in almost all aspects of the club since their arrival, but sure, more could have been done - especially following that breakthrough season. And there is no justification for not addressing the two glaringly obvious holes in the squad. However, should we have bought Wanyama/Berahino/A.N.Other regardless of cost? Would Wanyama or Berhanio at £30m plus guarantee us Champion's League Football?
Ultimately the team is picked and motivated by the manager. And this manager, the one before, the one before that and the one before that all have no plan B. We do well against teams that our principal philosophy works against. We generally get routed by teams that can effectively counter.
And that's why he is accountable. For what its worth, I like Poch and think we should persevere for some time as consistancy will bring its own reward.