These statements leave me speechless. How can one be so blind is beyond me.
First at all Jones, Giggs, Kagawa are not cms. Simple as that. I will repeat: they are not central midfielders. the fact that they can have occasional good game doesn't change the fact that you are right- they are not central midfielders.
Anderson get injured or is out of from for at least a third of each season, Cleverley is similar in this regard.
That leaves us with Carrick who is great but his preferred way of playing the game limits us to certain extend.
So we have 1 reliable midfielder, 2 semi-reliable and bunch of people who could do a job there. In emergency situations. So basically its 3 people competing for 2 spots.
Compare it to: Rooney (9,10), Kagawa (10), Giggs (10), Young (10), Januzaj (10), Hernadez (9), Welbeck (9,10), RVP (9,10) competing for two spots in our attack (depending on set-up). That's 6 players who competete for 2 slots and extra 2 who could do the job when needed.
Or to this: Vida, Rio, Smalling, Evans, Jones, Keane- that's 5 class players competing for 2 slots and one extra body.
I want everybody to understand this: playing Rooney, Jones, Giggs in cm position is papering over cracks. This midfield needs at least two specialized midfielders to give the mangers options.