I still get the feeling that our DoF model is this one...Thats fair. I think the comparison is probably closer to the season Lukaku went to West Brom.
As for the above, there's probably a lot of truth in all of the players not being utilised well. With the exception of Sandro (who I would have said was quite limited) I'd say all of them have ability. The issue is though, they all probably require quite different teams/approaches to be successful. I don't think we have really played to any of their strengths. There is a wider issue of recruitment here, that we have sought to by good players with no idea how to utilise them.
Sigurdsson was best when he had a big lump to hit it too. Keane in a side that sat deep and defended it'x box (he'd have looked great for Everton in 2004/5) Klaassen in a side where he's surrounded by players who dominate the ball and he can link it with his energy.
Good recruitment is not just about signing good players, but signing players that fit a system of play and asking them to do things they are comfortable with.
DoF; I've signed player 'A'.
Coach; But he's not what we need
DoF; You're the Coach, coach him till he is