I wonder if that is a Klopp instruction to have Fabinho more front footed as he wasn't over committing often for Monaco. I have also seen Hendo take that gamble many occasions when deployed as a 6 but only to get bypassed far too easily too. The difference is, I think Hendo reacts quicker, therefore isn't as reliant on Wijnaldum/Milner as Fabinho would be.
I do agree, Fabinho is better off with either Wijnaldum, Milner or Hendo next to him and always will be. I also think Fabinho brings the best out of Hendo/Wijnaldum/Milner. It reminds me of an Alonso and Masch midfield where Hendo/Wijnaldum/Milner assumes the role of Masch and Fabinho assumes the role of Alonso.
Where we have 1 "Alonso" in the squad, we have 3 "Masch's", and I feel losing that 1 Alonso changes our particular way of playing in midfield and we become less fluid and in control of the middle, hence the reason why I think Fabinho is the glue and key in midfield when he plays next to Hendo/Wijnaldum/Milner.
It's just a matter of positioning and experience for me. He'll get there, I have no doubt.
Henderson is different, because he triggers and leads the midfield press.
Sometimes it works, sometimes it doesn't and teams can get in behind the midfield a bit, but because they are usually sat so deep, it's not often they can do it in numbers.
What I saw yesterday, was 3 players rotating throughout the match.
Sometimes we had Fabinho and Keita with Wijnaldum up, then Fabinho and Wijnaldum with Keita up etc etc
The 3 were constantly rotating with 2 staying and 1 pushing up, depending on where the ball was.
It had the effect of confusing the opposition a bit, because they were never quite sure who to pick up, so in the end they went completely zonal.
This is why I think it's a mistake to say player X is "the 6", because they'll all rotate in and out of the 2 deep positions, and at times form a flat 3 (with Firmino dropping deep and sitting slightly in front).
To me, Klopp's goal is clear; 6 players who can all drop in and out of any of the midfield positions, rotate between them, and know when to rotate.
Within those 6 we'll have runners who can surge and break the lines.
Ideally, it should be all of them, but we're not quite there yet.