Who better to understand the deep lying playmaker than Koeman himself? If it's doable we should do it. He's a bit of a pain, but he's not Joey Barton levels of pain.
A fully fit Wilshere(if that is possible) in our midfield, or a comparable player, would really make us a very potent team.
I don't think we need a lot of players, but, we do need some very good ones.
We need to sign a good striker.
We need to sign a good creative midfielder.
Apart from that ,we have a strong and talented squad.
Goals..pleasantly surprised with Stekelenburg and Robles is adequate cover.
Full backs, Baines Coleman, Oviedo and Holgate, with Pennington and Browning as cover when they return from injury.
Centrebacks, Jagielka, Williams, Mori and again Holgate, Pennington and Browning
Wingers, Deulofeu, Lennon, Bolasie and Mirallas,
Central midfield, Barry,Davies,Gueye,McCarthy, Barkley
Creative midfielder, none
Striker, Lukaku, Kone(not of the required class).
If we fill those two areas I think we have done well.