I absolutely strongly refuse to put Davies in same category as Sissoko, Moura, Lamela, Winks and Sanchez.
Point is that Davies is VERY reliable in basic things. You know that he will deliver the basic things in every game.
Nail on head. Perfect professional: diligent, concentrates on marking his man
(looking at you Kyle Walker, Aurier),
doesn't play suicide balls across the box (Walker, Sanchez)
doesn't give away silly penalties (Walker, Sanchez, Aurier)
doesn't give away cheap free kicks in dangerous spots (Aurier, Sissoko)
doesn't get red cards putting the rest of the team in the shit
doesn't get early yellows, which puts him at real risk (where do you start on this one)
doesn't get suspensions which screw up the rotations
The first and key role of a defender is to defend. If you can put in a belter of a cross, then that's only great if you haven't given away a silly goal beforehand.
I imagine he trains very well, needs the minimum of coaching, managerial attention (Aurier, Sanchez)
There's a lot to be said for knowing your limitations and playing accordingly.
Strikes me as being a pretty bright bloke, could make a could pundit or even manager.
And he's a VERY capable CB