I'm not sure a specialist would fit in with the changes in shape seen this season.
There is a very solid base there in Henderson and Wijnaldum and obviously one of them will need to make way if Fabinho is to feature more heavily. Then allowing the likes of Keita and Shaqiri to shift between wide defensive positions and more central attacking mid options. That flexibility comes from the solid pairing behind them. To a casual observer that may look more like a 4231 or 433 but the flexibility comes from a 4222. It depends on whether the forward is dropping wide or the AM.
This is what I mean about specialists gradually falling out of fashion.
There will, of course, always be a place for specialists, but teams like Klopps will favour them less.
I think as well that there is far too much emphasis placed on formations and systems, and although discussing a basic shape is interesting, it seems far too many are fixated on the initial lineup, which they seem to think will completely dictate how we play.
Now there's no doubt in my mind that sometimes a shape dictates how we play, but it is sometimes fixated on to the detriment of understanding how we really play.
For instance, you'll often see our midfield (in defensive mode) play on a diagonal line, rather than flat, to try and push the play down a path we want it to go, or see what looks like a small cluster of players (but is really a double defensive line).
A lot of football at the highest level seems to me to be about forcing opponents to do things they don't want to do, rather than actually dictating the play in a more "traditional way".
It's all very interesting, and I have a feeling Klopp has a surprise or 2 up his sleeves for the mancs, come sunday.