Wow. IMO Bentaleb is the brightest talent we have. The only time we'll need to look at an upgraded DM is when Madrid make him the first £100m player.
I don't view Bentaleb as a "pure DM", so don't read it that way. I think Bentaleb has a bit more to his game, but it also means he's less defensive than a pure DM could be.
To me - upgraded DM = upgrade on Capoue/Stambouli
We need one for closing games out, for tougher matches (we concede more goals than anyone else in top 10 I believe)