Mata + Pogba + Ander isn't comparable to the Chelsea trio at all, to be fair. If anything, Pogba is similar to Lampard (who was the most advanced of the three) - a midfielder who operated in the zone between midfield and attack - with his biggest contributions coming nearer to the attacking third, but that's the closest fit among the three. Essien was a titanic box-to-box midfielder (ok - Herrera can do this, but he isn't remotely as physical with the ability to drive forwards), and Makélélé was the most perceptive midfielder the league has seen in the last couple decades in terms of positioning in the deep third, while also having the ability to keep things ticking along with basic but well timed passes.
So even if we leave the collective defensive aspect aside, from a functional standpoint (in terms of the way they 'fit' together, relative to our trio), it's several orders of magnitude apart. Mata + Pogba + Ander is unlikely to withstand most top quality, balanced midfield units because Pogba's inherent tendency is to carry the ball forward - which can and does leave positional holes for Herrera, since Mata is a more orthodox forward/#10. But if you have a point backwards instead of a point forward (Mata), Pogba will be liberated as Herrera and the #6 can both plug in the gaps, but it will additionally give Herrera the license to be more proactive and press the opponents in the center of the park.