You're being incredibly ignorant here so let's break it down.
If everyone is fit and available we have 6 CM's (not including Barkley, just leave that one). How often is this the case?
Barry has played nearly every game out of necessity and it's ignorant to think his form hasn't massively dropped this season. Davies looks a player but a month ago did we think he could be a regular starter? I didn't; he's just a kid.
Barry - Legs going
Gana - AFCON
Besic - Injured
McCarthy - Just returned to fitness, for now
Davies - Nice surprise
Schneiderlin - Not match fit yet
At best this season we've had 2-3 CM's fit with differing form and Davies as a nice surprise before Schneidelin signed.
Get your head out of your arse it was a position that needed strengthening and with over 2 weeks of the transfer window remaining it's premature to say Koeman has failed to prioritise key areas (funny, I didn't know he was in charge of bidding and contract negotiations either

)